2855
Summary
- // if you see it open
- RFC 4976 describes TLS connections and client authentication for relay use. The supplied evidence does not establish that all services on this port use these mechanisms.
About port 2855.
IANA assigns TCP port 2855 to msrp, described as “MSRP over TCP.” Whether a service on this port belongs on the public internet is Unknown: the supplied evidence identifies the protocol assignment but does not establish the intended audience or deployment of any host.
RFC 4976 describes relay extensions for the Message Session Relay Protocol (MSRP), which supports near real-time exchanges of binary content and can be signaled using a separate protocol such as SIP. The extensions let clients communicate directly or through relays that can forward messages and apply policy. This explains a possible protocol role; it does not show that a particular endpoint on port 2855 is an MSRP relay.
The RFC describes client connections to relays using TLS and client authentication. These are protocol mechanisms, not evidence that every implementation on this port uses TLS or requires relay access. The supplied material contains no scoped traffic measurement, deployment observation, or malware evidence.
- Registered service
- IANA names
msrpfor TCP port 2855 and describes it as MSRP over TCP. [Confirmed] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv - Protocol context
- RFC 4976 specifies MSRP relay extensions; the protocol supports near real-time exchanges of binary content. [Confirmed] — https://www.rfc-editor.org/rfc/rfc4976.txt
- Public exposure
- Unknown. The assignment and RFC do not establish the intended audience or deployment of a host using this port. [Unknown] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv
- IANA service
- msrp; “MSRP over TCP” [Confirmed] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv
Protocol role
MSRP relay extensions support forwarding between clients through relay intermediaries
- Port
- 2855/tcp [Confirmed] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv
- RFC reference
- RFC 4976 [Confirmed] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv
- Deployment and public exposure
- Unknown from supplied evidence [Unknown] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv
Service assignments.
| Name | Protocol | Description | Open frequency |
|---|---|---|---|
| msrp | UDP | — | 0.03% |
| msrp | TCP | MSRP over TCP | 0.00% |
Service assignments from the IANA Service Name and Transport Protocol Port Number Registry, with open-frequency data from nmap-services.