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IRCv3 Support — what we use, and why it matters to you ​

Audience: anyone evaluating Lurker's protocol support, plus contributors deciding what to build next. Last verified against main @ 9df7bb9. The server source is authoritative; file:line references point into this repository unless otherwise noted (e.g. upstream deps like irc-framework).

Most clients publish a bare list of IRCv3 capability names. That tells you almost nothing — "we support multi-prefix" is not a feature, it's an implementation detail. A capability only matters if it changes what the software can actually do for you.

So this page is organised the other way around: by the thing you get, with the capabilities that make it possible listed underneath. There's a plain reference table at the end if that's what you came for, an honest accounting of what we negotiate but don't yet use, and a list of what we don't support and what adopting it would buy you.

One structural note that explains several entries: Lurker's upstream IRC connection is built on irc-framework, which negotiates a baseline capability set of its own. Some capabilities below are consumed inside that library and reach Lurker only as better-shaped events. That's still real support, but we mark which is which rather than taking credit for it.

What you get ​

Your nicklist is correct, and it stays correct ​

Open a channel and the member list is right immediately — ranks, away state, and hostmasks — and it updates live instead of drifting until something forces a refresh.

  • multi-prefix — a member's full set of ranks arrives, not just the highest one. Lurker shows the highest glyph (~ & @ % +) but tests the whole set when deciding which moderation actions to offer you, so someone who is both +o and +v is understood correctly.
    vue_client/src/utils/memberPrefix.ts:19, vue_client/src/composables/useMemberActions.ts:167
  • userhost-in-names — full nick!ident@host masks arrive with the member list, so hostmasks are known the moment you join rather than after a round-trip.
    irc-framework/src/commands/handlers/channel.js:71
  • away-notify — away state updates live, with no polling.
    server/services/ircConnection.ts:1845
  • whox — on joining, Lurker issues a single extended WHO to learn away state for the whole channel at once, instead of one query per member. away-notify keeps it current from then on.
    server/services/ircConnection.ts:2326
  • chghost — when someone's hostmask changes (typically a cloak applied after they identify), you see one clean line and the nicklist updates in place, rather than a fake disconnect-and-rejoin.
    server/services/ircConnection.ts:1405
  • extended-join, account-notify — a member's registered account is known on join and stays current if they identify or log out later, without Lurker having to run WHOIS at you. Account changes update the nicklist silently: on networks like Libera, identifying fires an account change and a cloak change back-to-back, and rendering both would print two lines per identify in every channel you share.
    server/services/ircConnection.ts:1467

Your history is in the right order, on every device ​

Lurker stores everything and replays it to any browser or client you attach. That only works if timestamps are trustworthy.

  • server-time — messages are stored with the time the server stamped them, not the time Lurker happened to receive them. Lines that arrive late or out of order still land in the right place, and every device you attach sees the same ordering. Lurker normalises these to a canonical UTC form on the way in, and falls back to receive time for implausibly far-future stamps so one clock-skewed server can't reorder your buffer list.
    server/services/ircConnection.ts:294
  • echo-message — your own sent messages come back from the server, and that copy is the one Lurker stores. It's the only way your own messages learn their server-assigned ID and authoritative timestamp, which is what keeps them ordered identically across every device you're signed in on.
    server/services/ircConnection.ts:1533
  • msgid — on networks that send one, each message's server-assigned ID is stored and indexed. Messages on networks that don't send them, and messages from before Lurker kept them, have none. A message the network sends twice under the same ID, in the same channel or conversation, is stored once. It's groundwork for reactions and threaded replies, which are anchored on a message ID.
    server/services/ircConnection.ts:1528

Multi-line messages stay one message ​

Paste several lines and they travel as a single logical message where the network supports it, instead of being torn into separate messages that can interleave with other people's chatter. Incoming multi-line messages are reassembled the same way.

  • batch, draft/multiline, message-tags
    server/services/ircConnection.ts:518

You can see when someone is typing ​

Typing indicators in channels and DMs, both directions — Lurker sends yours and displays other people's. Currently a web-client feature; the iOS app doesn't render them yet.

  • +typing (carried over TAGMSG), which requires message-tags — so it's automatically off on networks that don't speak IRCv3, because those answer every TAGMSG with an error and an ungated send would toast you on each keystroke. Lurker also suppresses typing notifications to a target the server has already refused your messages to (a +R/+M channel you can't speak in), and to peers it knows are offline — otherwise every keystroke earns another error reply in your DM buffer.
    server/services/ircConnection.ts:4873 (send), :2746 (receive)

You can see when your DM peers are around ​

Presence dots on DMs, without Lurker hammering the network with WHOIS polls.

  • monitor — the presence transport. Lurker asks the server to tell it when specific people connect or disconnect. Networks without it get no presence tracking at all; we deliberately don't fall back to polling, because polling every open DM's peer is abusive to the network.
    server/services/ircConnection.ts:1298 (ISUPPORT gate), :2891 (seed)
  • extended-monitor — extends that to away/back state for people you share no channel with, which is what makes presence useful for DM peers rather than just channel regulars.
    server/services/ircConnection.ts:880

End-to-end encryption can identify who it's talking to ​

Lurker's optional E2E encryption keys off a stable ident@host identity rather than a nickname, since nicknames are trivially reassigned.

  • userhost-in-names — supplies that identity for everyone in a channel from the moment you join. Without it there's nothing stable to pin a key to.
    server/services/ircConnection.ts:3866

Connecting works, and failure is legible ​

  • sasl (3.1 / 3.2, PLAIN) — proper account authentication rather than /msg NickServ. Under 3.2, Lurker reads the server's advertised mechanism list and fails fast with a clear reason if PLAIN isn't offered, instead of hanging. A genuine authentication failure is treated as terminal — Lurker stops retrying and tells you, rather than looping against a password that will never work.
    server/services/ircConnection.ts:3115, :959
  • cap-3.1 / cap-3.2 — versioned capability negotiation, which is how the SASL mechanism list is readable at all.
  • cap-notify — if a network enables a capability mid-session (common right after a services upgrade), it's picked up without you reconnecting.
  • invite-notify — invites are recorded as a real "X invited Y" line that survives in your history.
    server/services/ircConnection.ts:1974

Attaching your own IRC client ​

Lurker can also act as a bouncer, so WeeChat, irssi, Textual or HexChat can attach to the same always-on connection your browser uses (see Self-Hosting). The capabilities Lurker offers downstream are a deliberately short, honest list — we advertise only what we actually implement.

You getPowered by
Log in with SASL instead of a server passwordsasl (PLAIN)
Backlog replays at its original timestamps, not at attach timeserver-time
Scrollback on demand — page back through Lurker's full stored history from your terminal clientdraft/chathistory
Joins, parts, quits, nick changes, kicks, and mode and topic changes in that scrollbackdraft/event-playback
What you've read in one client is read in the others, and in the web and iOS appsdraft/read-marker
A client connecting in the background doesn't count as you being heredraft/pre-away
Your own sent messages echoed back, if your client wants themecho-message
Your outgoing DMs attributed to you correctly in replayznc.in/self-message
Pick your network from a list instead of hardcoding username/networknamesoju.im/bouncer-networks, soju.im/bouncer-networks-notify
Message metadata passed through from upstreammessage-tags
Network list delivered as one grouped burstbatch
Attach a file in your client and get a link to send, when PUBLIC_BASE_URL is setsoju.im/FILEHOST
People's away, account and host changes, when your network sends themaway-notify, account-notify, chghost
The same for people you MONITOR but share no channel withextended-monitor, draft/extended-monitor
Accounts on JOINs and on each message, when your network sends themextended-join, account-tag
Every prefix and full hostmasks in NAMES, when your network sends themmulti-prefix, userhost-in-names
Invites other people get to your channelsinvite-notify
Told when a capability comes or goes, such as while your network reconnectscap-notify

Implementation notes worth knowing if you're writing against it:

  • Scrollback is capped at 1000 messages per request, advertised via the CHATHISTORY ISUPPORT token. Over-limit requests are rejected, not silently truncated — matching soju, whose clients read the token and stay under it. History lines carry the network's own msgid, the one your client saw on the line live. A line has none if Lurker never stored one for it (the network didn't send one, or the message predates Lurker keeping them), or if it's a decrypted E2E message, whose ID belongs to the encrypted line. Message references are timestamp only, as with soju.
    server/services/bouncer.ts:177, :570
  • A client that negotiates draft/chathistory gets no playback on attach, as with soju. It fetches the history it wants itself, so it doesn't see the same lines twice.
    server/services/bouncer.ts:2016
  • With draft/event-playback, history also has joins, parts, quits, nick changes, kicks, and mode and topic changes, and they count toward the limit, as with soju. Events that name your current nick are left out: your own join, part, quit or nick change, or a kick of you. Some clients apply every replayed line to what they show now, so an old part of yours would mark the channel as left. Host changes and invites aren't replayed, a JOIN is sent without extended-join's account and realname, and by default join, part, quit, nick and mode lines are kept for 7 days. Playback on attach stays messages only.
    server/db/messages.ts:617, server/services/bouncer.ts:2089
  • Tags that only a server may set — time, account, msgid, label, batch — are stripped from anything an attached client sends, so a downstream client can't forge them.
    server/services/bouncer.ts:302
  • Caps whose lines come from the network (away-notify, account-notify, account-tag, chghost, extended-join, multi-prefix, userhost-in-names) are offered only while the network you bind has them, as soju does. CAP LS 302 lists them before you pick a network, then CAP DEL takes back any that network lacks, and CAP NEW offers them again when it reconnects.
    server/services/bouncer.ts:157
  • What the network sends is trimmed to the caps your client negotiated, as soju and ZNC do: no AWAY without away-notify, a bare JOIN without extended-join, one prefix per nick in NAMES and WHO without multi-prefix, and so on. Without chghost, a host change arrives as the QUIT, JOIN and MODE a network sends in its place. Lurker never offers draft/multiline, so multiline messages arrive as separate lines.
    server/services/bouncerClientFilter.ts
  • Each attached client has its own MONITOR list, as in soju. Lurker merges the lists with its own watches (DM presence, nick regain) onto the network's one list, answers L and S from the client's list, and sends 730 and 731 only to the clients watching that nick. Everyone shares the network's limit, a client's list holds at most 1000 nicks, and a nick that doesn't fit gets 734.
    server/services/bouncer.ts:2416, server/services/monitorList.ts
  • Someone's away, account, host and realname changes reach a client that shares a channel with them. With extended-monitor, they also reach a client whose own MONITOR list has them, but not other clients: the network sends them for every nick on its one list, including Lurker's DM contacts and other clients' watches (soju sends them to every client). Both names are offered while the network has either.
    server/services/bouncerClientFilter.ts:401
  • Read markers are the account's, the same unread position the web and iOS apps show. MARKREAD with a time moves it to the newest message at or before that time, and every client on the network that negotiated draft/read-marker hears the move, as do the apps. A channel's marker comes after its JOIN, before NAMES; ask for a DM's with MARKREAD <nick>.
    server/services/bouncer.ts:2208, server/services/ircManager.ts:948
  • Away is the account's, as it is in the web and iOS apps. AWAY from any client sets or clears it on every network. That client gets its 305 or 306, and so does every other client, including one that attaches while you're away. AWAY * (from draft/pre-away) marks a connection that isn't you, such as goguma's background sync: it leaves your away alone. Any other attached client counts as you being here, so auto-away waits until the last one goes.
    server/services/bouncer.ts:2370, server/services/presence.ts:47
  • A reply goes only to whoever asked: your client, another attached client, the web app, or Lurker itself, which sends MODE and WHO when it joins a channel. A network's replies don't say who asked, so Lurker matches them to its queries in the order they went out.
    • Replies that name their channel or nick (WHOIS, WHOWAS, NAMES, TOPIC, channel modes) are matched by that name, so those queries go out at once.
    • Replies to WHO, LIST, ISON, USERHOST and a MODE for your own nick name nothing. Each of those waits until the last one of its kind is answered, as soju does for WHO and LIST.
    • MODE #channel is answered from Lurker's last reply until a mode it shows changes.
    • A query the network never answers ends after 30 seconds. WHO, WHOIS, WHOWAS, LIST, NAMES and list-mode queries then get their end numeric, marked Command aborted; the others get nothing.
      server/services/replyRouter.ts
  • A CTCP request such as VERSION gets one answer. While an IRC client is attached, it gets the request and Lurker stays quiet, as with ZNC, and its VERSION reply goes out with via Lurker <version> added. If that client doesn't answer (goguma and gamja never do), nobody does. With no client attached, Lurker answers. Once you change a CTCP reply in settings, that type stays Lurker's and no client sees the request: Lurker sends your reply, or nothing if it's empty or CTCP replies are off. A connection that sent AWAY * doesn't count as attached.
    server/services/ctcp.ts, server/services/ircConnection.ts
  • With soju.im/bouncer-networks-notify, your client hears when a network is added, edited or deleted in Lurker, and each notice carries only what changed. A network that failed to connect says why in its error attribute until it connects. A client attached to a network that's deleted is disconnected. Networks are managed in Lurker itself, so ADDNETWORK, CHANGENETWORK and DELNETWORK are refused.
    server/services/bouncer.ts:1631
  • soju.im/FILEHOST points your client at <PUBLIC_BASE_URL>/api/filehost. It's only advertised when PUBLIC_BASE_URL is set to an https URL and your account has an uploader. Your client uploads there with the credentials it logged in with: HTTP Basic with your password or a read-write API token (a /network or @client in the username is ignored), or an OAuth token as the password or as a Bearer token. The file goes through the same uploader and rules as an upload from the web app: images, text and audio/video only, images re-encoded, and it shows in your uploads list. The answer is 201 Created with a Location; errors are plain text. Failed logins count toward the same limit as the web sign-in. A network's own FILEHOST token is never passed on, so your client can't send your Lurker password to the network's upload server.
    server/routes/filehost.ts, server/services/bouncer.ts:584

Reference table ​

Capability names as they appear on ircv3.net. "Client" is Lurker connecting out to a network; "Bouncer" is your IRC client attaching to Lurker.

CapabilityClientBouncer
cap-3.1, cap-3.2✅✅
cap-notify✅✅
sasl-3.1, sasl-3.2 (PLAIN)✅✅
server-time✅✅
message-tags✅✅
msgid✅✅
echo-message✅✅
batch✅✅
draft/multiline✅—
+typing✅—
draft/chathistory—✅
draft/event-playback—✅
draft/read-marker—✅
draft/pre-away—✅
multi-prefix✅✅
userhost-in-names✅✅
away-notify✅✅
extended-join✅✅
account-notify✅✅
chghost✅✅
invite-notify✅✅
monitor✅✅
extended-monitor✅✅
whox✅—
znc.in/self-message—✅
soju.im/bouncer-networks (+-notify)—✅
soju.im/FILEHOST—✅

Negotiated but not yet used ​

In the interest of not padding the list: these are requested and acknowledged, but nothing in Lurker reads them yet. We'd rather say so than count them.

CapabilityStatus
account-tagAcknowledged, but nothing reads the per-message account tag. Account information comes from extended-join and account-notify instead. The bouncer does pass the tag on to attached clients that ask for it.
draft/message-tags-0.2, znc.in/server-time-iso, znc.in/server-timePre-standardisation aliases requested by irc-framework for older servers. Superseded by message-tags and server-time.

Not supported yet ​

Kept deliberately, as a roadmap. Ordered by what we think it would actually buy you, not by spec number.

High value — natural fits for features Lurker already has ​

CapabilityWhat it would give you
+draft/reactEmoji reactions on messages. Lurker already stores the msgid that reactions anchor to, so the hard part is done.
+replyThreaded replies, anchored on the same stored msgid.
draft/chathistory (as client)Backfill missed history from an upstream bouncer or a network that stores it. Note the asymmetry: Lurker serves chathistory downstream but doesn't consume it upstream, so gaps from a Lurker outage can't currently be filled in.
standard-repliesMachine-readable FAIL/WARN/NOTE errors, so command failures render as real explanations instead of raw numerics.
draft/message-redactionWhen someone deletes a message, it disappears from your view too, rather than persisting forever in Lurker's history.

Moderate value ​

CapabilityWhat it would give you
labeled-responseReliable correlation of a command with its reply, which makes command results attributable even when several are in flight.
setnameChange your realname without reconnecting. Lurker doesn't request this today.
bot-modeVisually distinguish bots from people in the nicklist and message list.
draft/metadataServer-side profile data — avatars being the obvious use.
draft/account-registrationRegister a network account during onboarding, instead of sending someone off to /msg NickServ.
draft/pre-awaySet away state before registration finishes, closing the brief window on reconnect where you appear present but aren't.
utf8onlySkip encoding guesswork on networks that guarantee UTF-8.
draft/channel-renameFollow a channel rename without a part/join cycle.
stsAutomatic upgrade to TLS and downgrade protection. Lower priority than it sounds — Lurker connects with TLS directly — but it would harden a misconfigured plaintext connection.

Low value or not applicable ​

CapabilityWhy it's not a priority
starttlsSuperseded in practice by connecting with TLS directly, which Lurker does.
websocketsLurker connects to networks over TCP from the server; browser WebSocket transport isn't relevant to that path.
webircDesigned for gateways relaying many users, and requires per-network operator trust. Lurker's connections are per-user.
no-implicit-namesA join-time optimisation for very large channels; little benefit at Lurker's scale.
account-extban, draft/oper-tag, draft/network-icon, draft/extended-isupport, client-batch, +draft/channel-contextNarrow or largely server-side; no user-visible feature blocked on them today.

Released under the MPL-2.0 License.

Copyright © 2026 Brad Root