Port 9902Endpoint Handlespace Redundancy Protocol (ENRP) over SCTP/TLS

ENRP peer channel for RSerPool registrars, carried over SCTP with TLS.

transport: sctp
in transit: encrypted
assignment: official
risk: 2/10
lookups: 0

also known as enrp-sctp-tls, ENRP/TLS, ENRP

Technical Details

what runs on :9902

The IANA assignment is the ENRP server channel over SCTP with TLS. An SCTP association is established first, followed by a TLS handshake; ENRP control messages are exchanged over the protected channel once TLS is established. ENRP is used by RSerPool Pool Registrars to coordinate handlespace information between registrars. Port 9901 is the related ENRP server-channel assignment without the TLS designation. Because this uses SCTP rather than TCP, TCP-only port scans may not detect it.

Security Information

exposure of :9902

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 1,862 ports — this one sits 0.6 below.

in transit

encrypted

payloads are protected on the wire

assignment

official

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

reachable over

sctp

every listening transport is another surface to filter at the edge

security overview

This is a specialized registrar control-plane service and generally should be reachable only by trusted ENRP peers, not exposed broadly to the internet. TLS protects traffic in transit, but peer authorization depends on appropriate certificate and policy configuration; restrict SCTP access to the intended registrars and monitor for unexpected associations.

Record

iana registry entry

port: :9902
service: Endpoint Handlespace Redundancy Protocol (ENRP) over SCTP/TLS
transport: SCTP
encryption: tls / encrypted
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: This port is assigned to the TLS-protected ENRP server channel in the Reliable Server Pooling (RSerPool) architecture. It is intended for communication between ENRP Pool Registrars, which maintain and coordinate server-pool handlespace; it is not a general-purpose web or client service.
lookups: 0rank 993
added: 2026-10-16
updated: 2026-10-16
references: IANA service name registry — port 9902
RFC 5353

Something wrong?

This record is maintained by the engineers who use port 9902. 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 2026-10-16.

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

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all 1,862 in network services →

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :9902Endpoint Handlespace Redundancy Protocol (ENRP) over SCTP/TLS

Technical Details

Security Information

Related Ports

Port 9902Endpoint Handlespace Redundancy Protocol (ENRP) over SCTP/TLS