356
Summary
- // if you see it open
- No documented malware or backdoor association. auditmypc.com's port database explicitly marks 356 'Virus / Trojan: No,' though it carries generic site-wide boilerplate warning language that is a template artifact, not a specific finding. No Shodan/Censys, SANS ISC, or scanning writeups mentioning port 356 were found.
- // analyst note
- An open port 356 has no confirmed legitimate application behind it — treat as anomalous/unexplained and investigate rather than assume routine use.
About port 356/tcp.
Port 356/tcp carries no publicly documented protocol — IANA lists the name cloanto-net-1 ("Cloanto Net 1") with no RFC or reference behind it — so whether it belongs on the public internet cannot be confirmed either way; treat an open 356/tcp as unexplained rather than assume it is safe or routine.
The IANA Service Names and Port Numbers Registry confirms only the bare registration: service name cloanto-net-1, description "Cloanto Net 1," assignee Michael Battilana, registered 2010-04-30, and dual-listed on both TCP and UDP. The Reference column is blank — no technical specification is cited, and none should be invented.
The assignee's name and the registration string plausibly tie to Cloanto Corporation, publisher of the Amiga-emulation suite "Amiga Forever," which ships legacy Amiga connectivity tools. That link is circumstantial only: no primary source describes an actual wire protocol, handshake, or client tied to port 356, so it is flagged Unknown rather than asserted.
No application or service was found with sourced, documented evidence of generating traffic on this port. Secondary port-list aggregator sites (SpeedGuide, tcp-udp-ports.com, auditmypc.com, ports.my-addr.com) all simply restate the bare IANA name with no software identified, and no forum threads, vendor docs, or scan writeups name a specific piece of software using it.
- IANA assignment
cloanto-net-1— "Cloanto Net 1"; reference (blank — no RFC cited); assignee Michael Battilana; registered 2010-04-30; dual-registered 356/tcp + 356/udp [Confirmed] — IANA Service Name and Transport Protocol Port Number Registry- Range class
- well-known (0–1023)
- Prevalence
- Unknown — no nmap-services or scan-prevalence data found for 356/tcp in this pass [Unknown]
- Related ports
- Unknown — no functionally related ports surfaced in research
Primary use
Unknown — no published specification describes the protocol behind this registration [Unknown]
Other/unofficial uses
circumstantial, unconfirmed association with Cloanto Corporation's Amiga Forever emulation/legacy-connectivity tooling, based only on the assignee's affiliation
Security implications
no documented malware or backdoor association; auditmypc.com's own database marks it "Virus / Trojan: No"
Typically seen on
Unknown — no confirmed deployment context; possibly Cloanto-related Amiga tooling (unconfirmed) [Unknown]
- Analyst note
- An open port 356 has no confirmed legitimate application behind it — treat as anomalous/unexplained and investigate rather than assume routine use.
About port 356/udp.
Port 356/udp carries no publicly documented protocol — IANA lists the name cloanto-net-1 ("Cloanto Net 1") with no RFC or reference behind it — so whether it belongs on the public internet cannot be confirmed either way; treat an open 356/udp as unexplained rather than assume it is safe or routine.
IANA registers the service name cloanto-net-1 with the description "Cloanto Net 1," assignee and contact Michael Battilana, and a registration date of 2010-04-30. The Reference (RFC) column is blank — no protocol specification is cited, and the assignment is dual-registered identically on 356/tcp and 356/udp.
The assignee's name and the registration string plausibly tie to Cloanto Corporation, publisher of the Amiga-emulation suite "Amiga Forever," which ships legacy Amiga connectivity tools. That link is circumstantial only: no primary source describes an actual wire protocol, handshake, or client tied to port 356, so it is flagged Unknown rather than asserted.
No application or service was found with sourced, documented evidence of generating traffic on this port. Secondary port-list aggregator sites (SpeedGuide, tcp-udp-ports.com, auditmypc.com) all simply restate the bare IANA name with no software identified, and no forum threads, vendor docs, or scan writeups name a specific piece of software using it.
- IANA assignment
cloanto-net-1— "Cloanto Net 1"; reference blank (no RFC); assignee/contact Michael Battilana; registered 2010-04-30; dual-registered 356/tcp + 356/udp [Confirmed] — IANA Service Name and Transport Protocol Port Number Registry- Range class
- well-known (0–1023) [Confirmed]
- Prevalence
- no nmap-services open-frequency data surfaced in this research pass [Unknown]
- Related ports
- 356/tcp (identical dual registration, same service name) [Confirmed]
Primary use
Unknown — IANA registers only the bare assignment (service name cloanto-net-1, description "Cloanto Net 1", assignee/contact Michael Battilana, Registration Date 2010-04-30, Modification Date blank, Reference blank, dual-registered 356/tcp + 356/udp); no protocol specification or function is documented
Other/unofficial uses
circumstantial, unconfirmed association with Cloanto Corporation's Amiga Forever emulation/legacy-connectivity tooling, based only on the assignee's affiliation
Security implications
no known malware/CVE association found; auditmypc.com reports "Virus/Trojan: No" for UDP 356; broader exposure risk otherwise Unknown
Typically seen on
Unknown — no confirmed deployment context; possibly Cloanto-related Amiga tooling (unconfirmed) [Unknown]
- Analyst note
- an open port 356/udp has no confirmed legitimate application behind it — treat as anomalous/unexplained and investigate rather than assume routine use.
Service assignments.
| Name | Protocol | Description | Open frequency |
|---|---|---|---|
| cloanto-net-1 | UDP | — | 0.06% |
| cloanto-net-1 | TCP | Cloanto Net 1 | 0.00% |
Service assignments from the IANA Service Name and Transport Protocol Port Number Registry, with open-frequency data from nmap-services.