3863

IANA registers UDP port 3863 as asap-udp, with RFC 5352 as its reference. That identifies a registry assignment, not a service observed on a host. The available evidence does not establish whether this port should be reachable from the public internet, so its recommended exposure is Unknown.

RFC 5352 describes ASAP as part of a server-pooling protocol suite with ENRP, supporting handle-based addressing, load sharing, and failover. The RFC is Experimental and says the ASAP/ENRP handlespace is not Internet-wide. This gives useful context about the protocol’s intended scope, but does not show that UDP 3863 is deployed for those functions.

There is a transport distinction in the evidence: RFC 5352 says ASAP messages between Pool Elements and ENRP servers must use SCTP, while IANA separately registers the name asap-udp for UDP 3863. The supplied material does not explain that UDP assignment’s role. Do not treat the RFC’s SCTP requirement as proof of UDP behavior, or infer an application, traffic prevalence, or safety from the registration alone.

Exposure

Unknown. The evidence establishes a UDP registry assignment but does not establish the intended audience or whether hosts should accept public connections.

Protocol context

RFC 5352 describes ASAP for server pooling with ENRP, including handle resolution, load sharing, and failover; its handlespace is not Internet-wide.

Transport caveat

RFC 5352 requires SCTP for ASAP messages between Pool Elements and ENRP servers. The available evidence does not explain how that requirement relates to IANA’s UDP registration.

IANA service name

asap-udp [Confirmed] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv

Protocol context

ASAP is described as part of a high-availability server-pooling suite with ENRP

Port

3863/udp [Confirmed] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv

RFC reference

RFC 5352 [Confirmed] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv

UDP deployment

Unknown [Unknown] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv

Public-internet exposure

Unknown [Unknown] — https://www.rfc-editor.org/rfc/rfc5352.txt