474

Port 474/tcp carries no documented service — it is IANA-registered under the bare name tn-tl-w1 with no description, no RFC or reference, and no discoverable primary-source explanation of what the service does, so it should be treated as an unverified legacy assignment rather than exposed to the public internet.

The IANA Service Name and Transport Protocol Port Number Registry lists 474/tcp as tn-tl-w1, paired with a separate registration of tn-tl-w2 on 474/udp. The tcp row carries no assignee at all — the Assignee/Contact columns are empty; only the udp row is registered to Ed Kress. Neither entry carries a description or an RFC citation, and the reference field is blank. No independent vendor document, spec, or blog post explaining what tn-tl-w1 does was located in an August 2026 search.

A recurring trap in secondary port-list sites (SpeedGuide, WhatPortIs, Tecniwao, portlookup.com) is conflating this port with 475/tcp (tcpnethaspsrv, the Aladdin/SafeNet HASP dongle licensing service, now part of Thales). Port 475 is a real, separately-registered IANA entry distinct from 474; that HASP association belongs to 475, not this port, and is not carried into this entry.

No CVE referencing port 474 specifically is recorded in the NVD as of an August 2026 search. No malware/trojan association could be established for 474/tcp; auditmypc.com's port page for 474 carries only the site's standard templated framing, not a port-specific verdict. No honeypot or internet-wide-scanning report specific to 474/tcp was found in the same search.

IANA assignment (tcp)

tn-tl-w1 — no description text; reference blank; assignee unlisted in the registry row [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry tn-tl-w1 474/tcp

IANA assignment (udp, paired)

tn-tl-w2 — no description text; reference blank; assignee Ed_Kress [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry tn-tl-w2 474/udp

Dual registration

both 474/tcp and 474/udp are IANA-registered, under different names on the same port number [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry tn-tl-w1 474/tcp; tn-tl-w2 474/udp

Range class

well-known/system range (0–1023) [Confirmed] — this site's own tooling (range: "system")

Prevalence

nmap-services open-frequency for 474/tcp = 0 (sampled, not observed open); 474/udp ≈ 0.000214 [Confirmed] — this site's own tooling (port 474)

Related ports

475/tcp (tcpnethaspsrv, Aladdin/SafeNet HASP) — a distinct, frequently-confused adjacent registration, not a functional relative [Confirmed] — https://whatportis.com/ports/475_tcpnethaspsrv-aladdin-knowledge-systems-hasp-services-tcpip-version

Protocol purpose

Unknown — no RFC, vendor doc, or spec describing tn-tl-w1/tn-tl-w2 was found; not to be confused with the unrelated, well-documented TL1 telecom network-management protocol, which no source ties to this port

Security implications

no CVE recorded in NVD referencing port 474 as of an August 2026 search; no malware/trojan association could be established — auditmypc.com's port page carries only the site's standard templated framing, not a port-specific verdict; frequently confused in secondary sources with 475/tcp (tcpnethaspsrv/HASP), a distinct port

Typically seen on

no documented deployment pattern found; an open 474/tcp is statistically rare (frequency 0 in the nmap-services sample)

Common applications generating traffic

Unknown — no vendor documentation, blog, or forum/support thread reporting specific software observed on 474/tcp or 474/udp was found in an August 2026 search [Unknown]

Port 474/udp is registered with IANA under the short name tn-tl-w2, but IANA publishes no expanded protocol description or RFC for it, so there is no confirmed answer for what actually runs on the port — it should be treated as an undocumented, likely-dormant legacy registration rather than a service expected on the public internet, and any observed traffic on it is worth investigating rather than assuming benign.

IANA's registry lists tn-tl-w2 with description identical to the name, assignee Ed_Kress, and a blank Reference column. The port is dual-registered: 474/tcp carries the paired short name tn-tl-w1, with no assignee recorded on that side. Neither entry cites a defining RFC.

The tn-tl- naming prefix recurs across a small cluster of otherwise-unrelated port numbers registered to the same assignee: 476/tcp+udp (tn-tl-fd1), 1580/tcp+udp (tn-tl-r1/r2), and 1584/tcp+udp (tn-tl-fd2). IANA does not document what product or protocol this family belongs to, so the grouping is a registry pattern, not a confirmed relationship.

Measured prevalence for 474/udp, from the repo's port-data.json (built from nmap-services), is an open-frequency of 0.000214 (about 0.02%). The tcp counterpart, 474/tcp, reads exactly 0 in the same source — a real sampled reading of "not observed open," not a missing data point.

A search of vendor documentation, forums, and general port-list references as of August 2026 turned up no credible, independently-corroborated application using 474/udp. One low-quality aggregator snippet named "tivoli-npm," but that name contradicts IANA's own tn-tl-w2 listing and could not be corroborated elsewhere, so it is not reported as a finding.

IANA assignment

tn-tl-w2 — description "tn-tl-w2"; assignee Ed_Kress; Reference field blank [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry tn-tl-w2 474/udp

Dual registration

474/tcp = tn-tl-w1, no assignee recorded [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry tn-tl-w1 474/tcp

Range class

well-known (0–1023, IANA "system" range) [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry tn-tl-w2 474/udp

Prevalence

nmap-services open-frequency 474/udp = 0.000214 (~0.02%); 474/tcp = 0 (sampled, not observed open) [Confirmed] — this site's own tooling

Primary use

Unknown — IANA registers the short name but publishes no expanded protocol description or RFC

Other/unofficial uses

none independently corroborated as of an August 2026 search; an aggregator's "tivoli-npm" mention conflicts with the IANA listing and is unverified

Security implications

no CVE or malware/trojan association found as of an August 2026 search

Typically seen on

Unknown — no application sightings independently confirmed [Unknown]

Related registrations (same assignee, same `tn-tl-` prefix)

476/tcp+udp (tn-tl-fd1), 1580/tcp+udp (tn-tl-r1/tn-tl-r2), 1584/tcp+udp (tn-tl-fd2) [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry tn-tl-fd1 476/tcp

Analyst note

treat an open 474/udp as anomalous and investigate; no legitimate, documented use is known.