IRC security and privacy: TLS, SASL, cloaks and not leaking your IP

IRC predates most modern thinking about security, and out of the box it has a few sharp edges — most notably that, by default, the network and sometimes other users can see your IP address. None of this is hard to fix; it's a short checklist of settings. Do these once and IRC is as private as you need it to be.

1. Always use TLS #

The single most important setting. Connect on the TLS port — 6697 — not the plaintext port (6667). Without TLS, your messages and (on networks where you send one) your password travel in clear text, readable by anyone between you and the server.

Every network in the 2026 list offers 6697. Every client worth using supports it. There is no reason in 2026 to connect in plaintext except a one-evening experiment on localhost. Turn it on and forget about it.

2. Authenticate with SASL #

Registering your nick protects your identity; SASL is the secure way to log into it. Instead of connecting and then messaging NickServ with your password (which means you're briefly online, unauthenticated, with your real host possibly exposed), SASL authenticates you during the connection handshake, before you've fully joined.

The practical wins: you're identified from the first instant, you can join registered-only (+r) channels immediately, and on networks that cloak based on your account, your cloak applies before anyone sees your real host. Every modern client has a SASL setting — fill in your account name and password there rather than scripting a NickServ message. The mechanics are in the protocol article.

3. Hide your IP with a cloak #

By default, other users running a /whois on you may see your hostname or IP — which can reveal your ISP, rough location, or workplace. A cloak (or vhost) replaces it with something neutral.

• On most networks, registering and authenticating automatically gives you a cloak like user/yourname or a network-specific mask.
• Some networks let you request a custom vhost via HostServ (/msg HostServ HELP).
• EFnet and IRCnet, having no services, don't cloak — there your host is visible, and a bouncer (so the network sees the bouncer's host, not yours) is the standard workaround.

4. The VPN and Tor rules #

Networks treat anonymising connections differently, and it matters:

• Libera.Chat restricts VPN and Tor for unregistered users (a heavy abuse-prevention measure). Register an account first and you can generally connect over them.
• Some networks block commercial VPN ranges outright; others don't care.
• Several privacy-focused networks, and hackint, run Tor onion services so you can connect over Tor without it looking like a proxy at all. Ergo-based servers can run as Tor hidden services too.

If you need to connect anonymously, register your account over a clean connection first, then switch — most networks key their trust on the authenticated account, not the IP.

5. DCC: the one to be careful with #

DCC (direct client-to-client) sets up a direct connection between two users for file transfers and private chat — which means it can expose your IP to the other party and, for files, carries all the usual risks of accepting something from a stranger. The rules:

• Never auto-accept DCC file offers. Configure your client to prompt.
• Don't accept files from people you don't trust — the same judgement you'd apply to any download.
• Be aware that accepting (or sometimes just negotiating) a DCC can reveal your IP. A bouncer or routing DCC through it mitigates this.

The DCC article covers safe configuration in full.

6. Sensible habits #

The non-technical half of staying safe:

• Don't reuse passwords. Your NickServ password should be unique; a leak on one network shouldn't open another.
• Watch for fake services. A real NickServ is a network service — be suspicious of users messaging you claiming to be "NickServ" or asking you to paste your password or run commands. Services don't DM you out of nowhere demanding credentials.
• Channel logs are often public. Plenty of channels are publicly logged to the web. Assume what you say in a channel could be searchable later — because it frequently is.
• You are not anonymous by default. Even cloaked, you're identifiable across a session and to network operators. IRC offers privacy from casual observers, not anonymity from a determined one.

The whole checklist #

For 95% of users, three settings cover it: connect on 6697 with TLS, log in with SASL, and register so you get a cloak. That's a five-minute, one-time setup, after which IRC leaks nothing you didn't choose to share. The registration guide walks through the SASL and NickServ steps in your specific client.