Port 270GIST Q-mode

UDP Q-mode encapsulation for General Internet Signaling Transport (GIST) messages.

transport: udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

Technical Details

what runs on :270

GIST Q-mode uses UDP port 270 to carry GIST signaling messages, typically for initiating or maintaining signaling exchanges when a more persistent message-association transport is not yet available. Messages are sent as GIST protocol datagrams with GIST headers and signaling payloads; UDP provides no transport reliability or encryption, so reliability and association setup are handled by the protocol and its related transport mechanisms. Implementations may also use the related GIST service over TCP for message-association transport.

Security Information

exposure of :270

risk score

2/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 2.6 across 1,582 ports — this one sits 0.6 below.

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

udp

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

security overview

This port is not normally intended to be exposed broadly on the public Internet. An exposed listener may receive unsolicited or malformed GIST signaling traffic and could be used for reconnaissance or resource-exhaustion attempts; GIST Q-mode itself does not provide encryption, so deployments should restrict peers and protect signaling through network policy or an appropriate secure transport.

Record

iana registry entry

port: :270
service: GIST Q-mode
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: This port is used by implementations of the General Internet Signaling Transport (GIST) protocol for Query-Mode signaling in the NSIS architecture. It is rarely encountered outside specialized signaling deployments, and IANA records no specific registrant for the assignment.
lookups: 0rank 993
added: 2026-09-15
updated: 2026-09-22
references: IANA service name registry — port 270
RFC 5971

Something wrong?

This record is maintained by the engineers who use port 270. 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 2026-09-22.

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edit this record →back to the registry

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :270GIST Q-mode

Technical Details

Security Information

Related Ports

Port 270GIST Q-mode