Port 655Tinc VPN

Tinc VPN uses TCP and UDP port 655 for encrypted peer-to-peer mesh VPN connections.

transport: tcp · udp
in transit: encrypted
assignment: official
risk: 4/10
lookups: 0

Technical Details

what runs on :655

Tinc establishes authenticated, encrypted VPN connections between nodes using a TCP meta connection and UDP for direct encapsulated traffic when available. The protocol handles peer discovery, connection setup, encrypted packet transport, and mesh routing; traffic may fall back to TCP when direct UDP communication is unavailable. Port 655 is the conventional default for both transports.

Security Information

exposure of :655

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

security averages 3.6 across 252 ports — this one sits 0.4 above.

in transit

encrypted

payloads are protected on the wire

assignment

official

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

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Internet exposure is expected for tinc peers that must connect across the Internet, but access should be restricted to known peers where possible and the daemon kept updated. An attacker can probe the service and attempt protocol or authentication attacks; a compromised or authorized peer may gain access to the VPN's routed networks, so node credentials and network policy remain important.

Record

iana registry entry

port: :655
service: Tinc VPN
transport: TCPUDP
encryption: tls / encrypted
assignment: iana registered
risk: 4/10caution
category: Security Remote Access
usage: Tinc is a lightweight, peer-to-peer mesh VPN daemon used to connect hosts and private networks across routed or public networks. Its default listening port is 655 on both TCP and UDP, although deployments can configure another port.
lookups: 0rank 994
added: 2026-08-31
updated: 2026-08-31
references: IANA service name registry — port 655

Something wrong?

This record is maintained by the engineers who use port 655. 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 2026-08-31.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

Related Ports

all 252 in security →

the 8 most looked-up other ports in security — 252 ports carry that label.

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:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Squid Proxy HTTP	TCP	Web Services	caution	45.8k
:8080	HTTP Alternate	TCPtls	Web Services	caution	44.9k
:7000	Vuze HTTPS Tracker	TCPtls	Security	caution	28.9k

risk mix of the 8 listed

caution100%

3 of 8 encrypted

Port :655Tinc VPN

Technical Details

Security Information

Related Ports

Port 655Tinc VPN