Port 6667IRC

Internet Relay Chat, commonly used for cleartext client and server connections.

transport: tcp
in transit: cleartext
assignment: official
risk: 6/10
lookups: 0

Technical Details

what runs on :6667

IRC runs over TCP. A client normally establishes a connection, then sends NICK and USER commands; the server responds with numeric replies and may issue a capability negotiation before registration completes. Messages are line-oriented and terminated with CRLF, with a maximum length of 512 octets including the terminator under RFC 2812. Port 6667 is the standard IRC service port; ports 6665 through 6669 are also historically used by IRC services, while TLS is commonly deployed on port 6697.

Security Information

exposure of :6667

risk score

6/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

voice and chat averages 3.4 across 157 ports — this one sits 2.6 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp

every listening transport is another surface to filter at the edge

security overview

Traditional IRC on port 6667 is unencrypted, so credentials, messages, and server metadata can be observed or modified on the path. Internet-facing IRC servers may be abused for spam, botnet command-and-control, connection flooding, or exploitation of server and client vulnerabilities; restrict administrative interfaces, enforce authentication and rate limits, and use TLS where supported.

Record

iana registry entry

port: :6667
service: IRC
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 6/10risk
category: Voice and Chat
usage: Port 6667 is the conventional TCP port for Internet Relay Chat (IRC) client and server connections. Engineers encounter it on IRC networks, chat clients, IRC bouncers, and bots; TLS-protected IRC commonly uses a separate port such as 6697.
lookups: 0rank 994
added: 2026-09-18
updated: 2026-09-18
references: IANA Service Name and Transport Protocol Port Number Registry
RFC 2812: Internet Relay Chat: Client Protocol

Something wrong?

This record is maintained by the engineers who use port 6667. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-18.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 157 in voice and chat →

the 8 most looked-up other ports in voice and chat — 157 ports carry that label.

port	service	proto	category	risk	views
:9090	Openfire Admin Console	TCP	Web Services	caution	34.2k
:1513	Garena Gaming	TCPUDP	Gaming	caution	33.1k
:9091	Openfire Admin Console (SSL)	TCPtls	Web Services	caution	28.3k
:2031	Mobrien Chat	TCPUDP	Web Services	caution	27.7k
:1720	H.323 Signaling	TCP	Network Services	caution	26.5k
:6005	Camfrog Chat	TCP	Voice and Chat	caution	25.2k
:3001	Miralix Phone Monitor	TCP	Network Services	caution	21.7k
:9009	Pichat Server	TCPUDP	Network Services	caution	19.7k

risk mix of the 8 listed

caution100%

1 of 8 encrypted

Port :6667IRC

Technical Details

Security Information

Related Ports

Port 6667IRC