242

Port 242 is registered with IANA under the service name direct, with the bare description "Direct," assignee Herb_Sutter, and contact Paul_Horton. The registration is dual — both 242/tcp and 242/udp carry identical entries apart from the transport field — and the Reference, Registration Date, and Modification Date columns are all blank in both the cached local registry CSV and the live IANA service-names-port-numbers text file, so no RFC or dated origin can be cited for this assignment. Beyond that bare registry record, the port is effectively undocumented: no RFC, vendor specification, or confirmed piece of software could be found actually implementing a "direct" service on this port. A cluster of SEO/content-farm port-lookup sites (ipfyi.com, portsmaster.org, portlookup.com, tcp-udp-ports.com) describe it as a "real-time communication service for messaging, collaboration, or gaming," but this phrasing is templated boilerplate repeated verbatim across unrelated port pages on those same sites and is not corroborated by IANA, any RFC, or vendor documentation — it is treated here as unverified marketing filler rather than fact. SANS Internet Storm Center's live port tracker shows ongoing low-volume opportunistic scan traffic on port 242 as of 2026-07-17, consistent with generic internet background noise rather than anything specific to this assignment. No malware or trojan association is confirmed for this port: no authoritative malware database or CVE records a threat tied to TCP 242. Net effect: this is a thinly documented, long-dormant IANA registration where the only solid facts are the registry metadata itself.

IANA assignment

direct — "Direct"; reference blank (no RFC cited); assignee [Herb_Sutter]; contact [Paul_Horton]; dual-registered 242/tcp + 242/udp [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry-554, https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt

Range class

well-known (0–1023) [Confirmed] — numeric range, IANA registry

Prevalence

no nmap-services frequency data available in this cycle; SANS ISC shows ongoing low-volume opportunistic scan traffic as of 2026-07-17, consistent with generic background port-sweep noise [Likely] — https://isc.sans.edu/data/port/242

Related ports

Unknown — no sourced relationship to neighboring or thematically related ports found

Primary use

no protocol spec, RFC, or confirmed vendor implementation exists; the "real-time messaging/collaboration/gaming" description found on several SEO-farm sites is unsourced templated content, not verified fact

Other/unofficial uses

none independently verified [Unknown]

Security implications

no confirmed malware, trojan, or CVE association for this port in any authoritative source; the only observed activity is generic low-volume opportunistic scan traffic

Typically seen on

Unknown — no confirmed software or deployment context found

Malware associations

none confirmed — no CVE or authoritative malware database records an association with this port

Analyst note

A responsive port 242 has no verified legitimate service behind it; treat any traffic as unexplained until corroborated, and disregard content-farm "risk: low" labels, which carry no stated methodology.

Port 242/udp is registered with IANA under the service name direct, carrying only the one-word description "Direct." The assignee on record is Herb Sutter, with Paul Horton listed as the registration contact. The registry's Reference column is blank for this entry, so no RFC or other specification document is cited for it, and none should be inferred — this is a bare name/description registration rather than a documented protocol. The entry is dual-registered: the adjacent tcp/242 row carries the identical service name, description, assignee, and contact, meaning both transports were reserved together under the same "direct" label. Beyond the registry line itself, no vendor product, open-source daemon, or published protocol specification could be found that is documented to use UDP port 242 by default, so its real-world function is effectively undocumented. From an exposure standpoint, SANS Internet Storm Center's live per-port dashboard shows ongoing low-level internet background-radiation scanning traffic against port 242, with a non-elevated ("green") threat indicator at the time this was checked. No documented malware family, trojan, or CVE was found tied specifically to this port in this research pass; that absence is reported as an unverified-clean result rather than a confirmed one, since trojan-port reference lists were consulted but do not name port 242 either way.

IANA service name

direct — description "Direct" [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry; https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt

IANA reference (RFC)

none — the Reference column is blank in the registry; no RFC exists to cite [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry

Registration/modification date

Unknown — IANA's port registry does not publish a date field for this entry (distinct from RIR/ASN RDAP records, which do carry a first-party top-level registration date) [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry

Dual registration

tcp/242 carries the identical service name, description, assignee, and contact [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry-554

Range class

well-known (0–1023) [Confirmed] — port number range is a fixed convention, no citation needed

Common software

Unknown — no specific software title identified in this pass [Unknown]

Malware/trojan association

none found in reference lists consulted; reported as absence-of-evidence, not a confirmed clean bill of health

Typically seen on

Unknown — no documented deployment context found [Unknown]

Assignee / contact

assignee [Herb_Sutter], registration contact [Paul_Horton] [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry

Primary/documented use

Unknown — no vendor product, daemon, or protocol spec found bound to this port beyond the bare IANA label [Unknown] — https://tcp-udp-ports.com/port-242.htm; https://portlookup.com/port-242/

Scanning exposure

SANS ISC shows ongoing opportunistic scan traffic against port 242 with a green (non-elevated) threat level at check time, though the page only gives relative "today/yesterday" counts with no absolute date [Confirmed] — https://isc.sans.edu/data/port/242