453

Port 453/tcp is registered with IANA under the service name creativeserver, described only as "CreativeServer"; no protocol specification or implementing software was ever publicly documented, so an open 453/tcp is anomalous and should be treated as a signal to investigate rather than a service that belongs on the public internet.

IANA lists 453 as a dual TCP/UDP well-known-range assignment with no assignee, no reference RFC, and no registration or modification date recorded in the registry (the IANA Service Name and Transport Protocol Port Number Registry creativeserver 453/tcp). The description field carries no content beyond the bare service name.

No vendor documentation, archived specification, or forum discussion identifying what software originally implemented CreativeServer has surfaced. Multiple independent port-reference sites (AuditMyPC, Connected.app) corroborate the same bare IANA facts but none can name an implementing product, current or historical, leaving the assignment effectively orphaned.

A search-engine snippet linking port 453 to Apple QuickTime Streaming Server / RTSP could not be traced to any primary or community source and conflicts with QuickTime Streaming Server's documented ports (554/tcp and a 6970+ UDP range); it is treated as unverified and is not repeated as fact here.

Measured against the nmap-services corpus, 453/tcp is almost never seen open (~0.0025%), while 453/udp is somewhat more common but still rare (~0.028%), consistent with the port's effectively orphaned status.

IANA assignment

creativeserver — "CreativeServer"; reference (blank — no RFC cited); assignee Not specified in registry; dual-registered 453/tcp + 453/udp [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry creativeserver 453/tcp; cross-checked https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?page=9

Range class

well-known (0-1023) [Confirmed]

Prevalence

nmap-services open-frequency 453/tcp ≈ 0.000025 (~0.0025%); 453/udp ≈ 0.00028 (~0.028%) [Confirmed] — this site's own tooling (built from nmap-services by this site's own tooling)

Related ports

no confirmed companion or paired port identified for the creativeserver assignment

Primary use

Unknown / effectively orphaned — formally registered but no RFC, vendor documentation, or archived spec describing the CreativeServer protocol has surfaced [Likely] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?page=9, https://www.connected.app/bg/ports/453, https://www.auditmypc.com/tcp-port-453.asp

Other/unofficial uses

none credibly sourced; a claim linking this port to Apple QuickTime Streaming Server/RTSP was checked and rejected as unsupported and inconsistent with QTSS's documented ports

Security implications

no CVE or named malware family documented for 453/tcp as of an August 2026 search; one secondary source (Connected.app) reports an unattributed claim of a "security database" flagging the port for malware, framed as opportunistic use of an obscure/unmonitored port rather than a named threat

Typically seen on

no current deployment pattern identified; an unexpected open 453/tcp is an anomaly to investigate [Unknown]

Analyst note

an open 453/tcp has no known legitimate current use — treat it as an anomaly worth investigating (decoy, backdoor, or stale legacy listener) rather than routine traffic.

Port 453/udp carries creativeserver, an IANA-registered but functionally abandoned service with no surviving specification and no confirmed current software behind it; it has no documented legitimate use and should be treated as anomalous if seen, not as something expected to face the public internet.

IANA registers 453 identically on both TCP and UDP as creativeserver, description "CreativeServer," with no assignee, no reference RFC, and no registration date recorded in the registry. The entry is a bare label — none of the surrounding documentation that would normally identify a protocol's origin or purpose survives.

A search for community sightings — vendor documentation, blog posts, forum or support threads — found no credible report of any current application generating traffic on 453/udp as of an August 2026 search. The registry neighbors 452/tcp+udp (sfs-config, Cray SFS config server), 454/tcp+udp (contentserver), and 455/tcp+udp (creativepartnr) share no documented functional link to 453, though the "content/creative" naming pattern across 453-455 suggests they were registered around the same time, possibly by related requesters.

nmap-services records an open-frequency of about 0.028% for 453/udp and about 0.0025% for the paired 453/tcp — both negligible, consistent with a port essentially never seen open in real scans.

IANA assignment

creativeserver — "CreativeServer"; reference (blank — none recorded); assignee Unknown; dual-registered 453/tcp + 453/udp [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry creativeserver 453/tcp and creativeserver 453/udp

Range class

well-known (0–1023) [Confirmed]

Prevalence

nmap-services open-frequency 453/udp ≈ 0.00028 (~0.028%); 453/tcp ≈ 0.000025 (~0.0025%, negligible) [Confirmed] — this site's own tooling

Related ports

452/tcp+udp (sfs-config, Cray SFS config server), 454/tcp+udp (contentserver), 455/tcp+udp (creativepartnr) — registry-adjacent, no confirmed functional link [Confirmed adjacency] — the IANA Service Name and Transport Protocol Port Number Registry sfs-config 452/tcp, contentserver 454/tcp, creativepartnr 455/tcp

Primary use

Unknown — no surviving RFC, specification, or protocol documentation found beyond the bare registry label; appears functionally abandoned [Likely] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?page=9, https://www.connected.app/bg/ports/453

Other/unofficial uses

none confirmed; no credible community sighting of a current application found as of an August 2026 search [Unknown]

Security implications

no CVE or named malware family documented for 453/udp as of an August 2026 search; not listed on the trojan/malware-port compilations checked; auditmypc.com's port-453-specific verdict could not be retrieved so is Unknown rather than negative [Likely] — http://www.chebucto.ns.ca/~rakerman/trojan-port-table.html, https://docs.trendmicro.com/all/ent/officescan/v10.6/en-us/osce_10.6_sp1_olh/gls_trojan_port.html

Typically seen on

Unknown — no confirmed deployments found; an open port here would be an anomaly worth investigating [Unknown]

Analyst note

creativeserver is an abandoned legacy IANA registration with no surviving specification or known current software; an open 453/udp is unusual and worth investigating rather than assumed benign.