416
Summary
- // typical exposure
- Anomalous (rarely legitimately open) — Port 416/tcp is an obscure legacy IANA registration with no documented modern software or protocol use; aggregators describe it as essentially unseen in current traffic, so a listener should be treated as an anomaly to investigate rather than expected legitimate traffic.
- // analyst note
- an open port 416 has no documented modern legitimate use — investigate as a possible legacy leftover or anomaly rather than assume normal service.
- // if you see it open
- No documented legitimate modern use; port-lookup aggregators recommend closing it unless a specific legacy system requires it. No malware association is documented — auditmypc.com's own verdict line for 416/tcp reads 'Virus / Trojan: No'; the 'flagged as a virus' wording on some aggregator pages is site-wide template boilerplate repeated across ports with only the number swapped. No dedicated scan-telemetry (ISC/DShield) page exists for this port, but nmap-services records a scan-frequency of 0.000201 for 416/tcp.
About port 416/tcp.
Port 416/tcp is IANA-registered under the name silverplatter, but no active, documented service uses it today, so a listener on this port should generally not be exposed to the public internet and is better treated as a legacy or anomalous finding than as an expected service.
The IANA registry lists the assignment with description "Silverplatter" and assignee Peter Ciuffetti, dual-registered on both TCP and UDP. The Reference field is blank — no RFC or standard document is cited — and the registry carries no registration or modification date for this entry, so both are recorded as Unknown rather than guessed.
No vendor documentation, blog post, or forum thread was found naming a current piece of software that generates traffic on this port. The historical name "SilverPlatter" (a discontinued reference-database/CD-ROM search product line) appears only in the IANA registration itself; independent third-party confirmation that this product actually used TCP/416 in practice was not found, so that association is noted but not asserted as fact.
Several port-lookup aggregator sites (SpeedGuide, PortsMaster, generic port-database pages) independently describe port 416 as obsolete in current internet use. No dedicated scan-telemetry page (e.g. an ISC/DShield port page) exists for it, but the nmap-services corpus records an open-frequency of 0.000201 for 416/tcp (this site's own tooling), roughly two openings per ten thousand hosts scanned. auditmypc.com's own verdict line for 416/tcp reads "Virus / Trojan: No" — the "flagged as a virus" language on some aggregator pages is site-wide template boilerplate, byte-identical across ports with only the number swapped, and is not evidence of any actual malware association with this port.
- IANA assignment
silverplatter— "Silverplatter"; reference (blank — no RFC cited); assignee Peter Ciuffetti; dual-registered 416/tcp + 416/udp [Confirmed] — IANA Service Name and Transport Protocol Port Number Registry- Range class
- well-known (0–1023) [Confirmed]
- Prevalence
- nmap-services open-frequency for 416/tcp ≈0.000201 [Confirmed] — nmap-services dataset (this site's own tooling)
- Related ports
- no specific cluster identified for this legacy assignment [Unknown]
Primary use
historical/legacy assignment for "silverplatter"; no active technical specification is publicly documented
Other/unofficial uses
none credibly sourced beyond the registration name itself [Unknown]
Security implications
essentially never legitimately open today; no malware association documented — auditmypc.com's own verdict line for 416/tcp reads "Virus / Trojan: No"
Typically seen on
no known modern hosts; treat as anomaly if seen [Unknown]
- Analyst note
- an open port 416 has no documented modern legitimate use — investigate as a possible legacy leftover or anomaly rather than assume normal service.
About port 416/udp.
Port 416/udp is registered with IANA under the name silverplatter, a legacy assignment tied to SilverPlatter Information's 1990s database search service; it has no confirmed modern legitimate use, so a responsive 416/udp should not be expected on the public internet and is worth investigating rather than accepting as routine.
The IANA registry lists the assignee as [Peter_Ciuffetti], leaves the Reference column blank (no RFC is cited), and dual-registers the name on both 416/tcp and 416/udp. No registration or modification date is present in the registry, so those fields stay Unknown rather than invented.
Historically, "silverplatter" traces to SilverPlatter Information Inc., a vendor known for CD-ROM and networked bibliographic/reference database products; this vendor lineage is plausible but only third-party-corroborated, not an IANA-stated fact [Likely]. The cached IANA registry row for port 416 confirms the bare registration facts: service name silverplatter, description "Silverplatter," assignee and contact [Peter_Ciuffetti], and a blank Reference column — correctly left blank rather than guessed [Confirmed].
No forum, vendor-doc, or P2P/game-client sighting of any specific application generating traffic on 416/udp was found, so common software usage is Unknown rather than guessed. auditmypc.com's own verdict line for 416/udp reads "Virus / Trojan: No" — the historical trojan/virus association some aggregator sites mention traces to site-wide template boilerplate repeated across ports with only the number swapped, not a port-specific finding.
- IANA assignment
silverplatter— "Silverplatter"; reference blank (no RFC cited); assignee[Peter_Ciuffetti]; dual-registered 416/tcp + 416/udp [Confirmed] — IANA Service Name and Transport Protocol Port Number Registry (cached CSV)- Range class
- well-known (0–1023)
- Prevalence
- nmap-services open-frequency for 416/udp ≈0.000675 [Confirmed] — nmap-services dataset (this site's own tooling)
- Related ports
- none identified with sourcing in this pass [Unknown]
Primary use
legacy IANA registration historically tied to SilverPlatter Information's database/CD-ROM search service; no evidence of active modern use
Other/unofficial uses
none identified with credible sourcing in this pass [Unknown]
Security implications
essentially never legitimately open today; no malware association documented — auditmypc.com's own verdict line for 416/udp reads "Virus / Trojan: No"
Typically seen on
no legitimate modern hosts identified; an observed instance should be treated as anomalous [Unknown]
- Analyst note
- Registry facts (name, blank reference, dual TCP/UDP registration) are Confirmed; the SilverPlatter vendor history is Likely (third-party corroborated only); modern usage and prevalence-derived exposure risk are otherwise Unknown — do not overstate confidence on the former.
Service assignments.
| Name | Protocol | Description | Open frequency |
|---|---|---|---|
| silverplatter | UDP | — | 0.07% |
| silverplatter | TCP | — | 0.02% |
Service assignments from the IANA Service Name and Transport Protocol Port Number Registry, with open-frequency data from nmap-services.