463

Port 463/tcp carries the IANA-registered service name alpes, but no protocol specification, RFC, or known software implementation has been identified for it, so whether traffic on this port belongs on the public internet is genuinely unknown rather than confirmed either way.

The IANA Service Names and Transport Protocol Port Number Registry lists 463 as alpes on both TCP and UDP, assigned to Alain Durand. The registry entry carries no description beyond the bare service name, no Reference/RFC field, and no registration or modification date — a minimal, largely administrative entry rather than a documented protocol.

No RFC, internet-draft, or vendor specification describing an alpes protocol could be located as of an August 2026 search. A Tech Support Forum thread titled specifically about port 463 "alpes" looked like a plausible community-sourced lead, but its current mirror returned HTTP 402 Payment Required and could not be read, so no claim is drawn from it. Generic port-lookup aggregator sites added nothing beyond restating the IANA name.

SANS Internet Storm Center shows only routine, low-volume background scanning on port 463 (roughly 2-10 hits per source IP on any given day) with a green (routine) threat level, consistent with general internet-wide scanning noise rather than a targeted campaign. auditmypc.com's port-463 page carries no trojan or malware listing for this port.

IANA assignment

alpes — bare service name, no description text beyond the name itself; reference (blank — no RFC cited); assignee Alain_Durand; dual-registered 463/tcp + 463/udp [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry alpes 463/tcp, the IANA Service Name and Transport Protocol Port Number Registry alpes 463/udp

Range class

well-known (0-1023) [Confirmed]

Prevalence

nmap-services open-frequency 463/tcp = 0.000000 (sampled, not observed open); 463/udp ≈ 0.000494 [Confirmed] — this site's own tooling (key "463")

Related ports

none identified as a documented pair or cluster for alpes [Unknown]

Primary use

Unknown — no RFC, internet-draft, or vendor specification for an alpes protocol was located

Other/unofficial uses

none confirmed; a possibly-relevant Tech Support Forum thread ("Alpes IP port 463") could not be retrieved (its current mirror returns HTTP 402 Payment Required), so no claim is drawn from it

Security implications

no CVE or named malware family documented for 463/tcp as of an August 2026 search; auditmypc.com shows no trojan/malware listing for this port (negative finding); SANS ISC shows only routine background scanning at a green threat level

Typically seen on

Unknown — no attributable application/software sighting was found for this port [Unknown]

Analyst note

463/tcp is a minimally-documented IANA registration with no known protocol implementation or software sighting; given the near-zero measured prevalence, an unexpected open 463 is worth investigating rather than assumed to be routine traffic.

Port 463/udp carries no documented protocol or established service; IANA lists it only under the bare name alpes with no RFC or description, so it has no known legitimate reason to be exposed to the public internet and any traffic on it should be treated as unexplained rather than assumed to be a known application.

IANA's Service Names and Port Numbers registry assigns 463 to alpes for both TCP and UDP, contact of record Alain Durand, with a blank Reference column — no RFC or specification is cited, and no other registry field describes what the service does or did.

An independent port-lookup aggregator corroborates only the bare name alpes with no accompanying description in that source's own cross-referenced library, reinforcing that this is a paper registration rather than a deployed, documented protocol.

A search across vendor docs, forums, and port-lookup aggregator sites as of an August 2026 search found no software, client, or service credibly reported as generating traffic on 463/udp. One forum thread title referencing the port existed on techsupportforum.com, but its content was paywalled and could not be verified, so it is not cited as a sighting.

SANS Internet Storm Center's per-port activity page for 463 shows only routine, low-level internet-wide background scanning — a handful of source IPs with single-digit-to-low-double-digit incident counts and a "green" (low) threat indicator, with no campaign or trend spike noted.

IANA assignment

alpes — "alpes"; reference (blank — no RFC cited in IANA registry); assignee [Alain_Durand]; dual-registered 463/tcp + 463/udp [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry alpes 463/udp

Range class

well-known/system (0–1023) [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry alpes 463/udp

Prevalence

nmap-services open-frequency 463/udp ~0.000494 (0.049%); 463/tcp = 0 (sampled, not observed open) [Confirmed] — this site's own tooling (alpes rows)

Related ports

462/udp (datasurfsrvsec) and 464/udp (kpasswd, Kerberos change-password) are the numerically adjacent system-range registrations, but neither shares a protocol family with 463 [Well-established] — this site's own tooling

Primary use

Unknown — no RFC, protocol specification, or IANA description accompanies this registration beyond the bare service name alpes

Other/unofficial uses

none credibly documented; no software or application found using 463/udp as of an August 2026 search

Security implications

undocumented legacy IANA assignment with no known protocol, software, or deployment; SANS ISC shows only low-level, "green"-rated background scan noise; no malware association verified either way

Typically seen on

Unknown — no confirmed deployment context was found [Unknown]

Analyst note

An open 463/udp has no known legitimate service behind it — treat any observed traffic as anomalous scan noise, a misconfiguration, or a custom/nonstandard use rather than assume a specific application.