552
Summary
- // typical exposure
- Anomalous (rarely legitimately open) — The registered devshr-nts/DeviceShare service appears never to have been implemented, so a responsive port 552/tcp is not a designed public or internal service and any activity on it should be treated as anomalous rather than expected traffic.
- // analyst note
- An open 552/tcp has no confirmed legitimate use — the registered DeviceShare service appears never to have shipped — so treat a responsive port as anomalous and worth investigating rather than expected traffic.
- // if you see it open
- No malware/trojan association is on record at AuditMyPC as of an August 2026 check (sourced negative). The registered DeviceShare protocol appears never to have been implemented, so a responsive 552/tcp is not expected legitimate traffic on any network and should be investigated as anomalous.
About port 552/tcp.
Port 552/tcp is IANA-registered under the service name devshr-nts ("DeviceShare"), but no working protocol was ever documented or publicly deployed for it, so this port should never be exposed to the public internet and a responsive host on it is an anomaly worth investigating rather than a normal service.
The IANA registry lists the service name devshr-nts, description "DeviceShare," assignee Benjamin Rosenberg, and a blank reference field, with dual registration on both 552/tcp and 552/udp. No RFC or other reference document is cited, and no registration or modification date is recorded in the registry row.
A third-party port-reference site (connected.app) characterizes devshr-nts as a service name that was "never launched, was abandoned early, or existed only within a company that no longer exists" — that is, the assignment appears to predate, or exist entirely without, any deployed protocol. This is a single-source characterization, so it is tagged accordingly rather than treated as confirmed.
Measured prevalence from this site's own port-data corpus (built from nmap-services) puts 552/tcp at an open-frequency of about 0.000013 (~0.0013%), with the paired 552/udp row at about 0.00084 (~0.084%) — both are sampled figures, not zero, but extremely rare either way.
- Exposure
- Anomalous — the registered
devshr-nts/DeviceShare service appears never to have been implemented, so legitimate traffic on 552/tcp is not expected on any network, internal or public. - Malware/Trojan association
- Not listed as malware/trojan-associated; AuditMyPC's port-552 page carries no malware/trojan flag for this port as of an August 2026 check (a sourced negative).
- Named CVE
- None found as of an August 2026 search; omitted rather than guessed.
- Observed applications
- No specific application, game client, or service was found reported by name as generating traffic on 552/tcp as of an August 2026 search; general port-lookup directories only restate the IANA registration.
- IANA assignment
devshr-nts— "DeviceShare"; reference blank; assignee Benjamin Rosenberg; dual-registered 552/tcp + 552/udp [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry devshr-nts 552/tcp- Range class
- well-known (0–1023), system-port range [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry
- Prevalence
- this site's own tooling open-frequency 552/tcp ≈ 0.000013 (~0.0013%); 552/udp ≈ 0.00084 (~0.084%) [Confirmed] — this site's own tooling
- Related ports
- dual-registered pair 552/udp; neighboring system-port assignments in the 550–560 block
Primary use
registered service name devshr-nts / "DeviceShare"; no known RFC, public specification, or documented protocol has been found [Unknown]
Other/unofficial uses
apparently never implemented — a third-party site describes it as never launched, abandoned early, or tied to a defunct company
Security implications
no malware/trojan association on record at AuditMyPC as of August 2026 (sourced negative); essentially never legitimately open given the apparently-unimplemented registered protocol
Typically seen on
not typically seen on any host type; a responsive port is an anomaly [Unknown]
- Analyst note
- An open 552/tcp has no confirmed legitimate use — the registered DeviceShare service appears never to have shipped — so treat a responsive port as anomalous and worth investigating rather than expected traffic.
About port 552/udp.
Port 552/udp is registered with IANA as devshr-nts, described only as "DeviceShare," but no known software has been found implementing it — so a responsive 552/udp is unexpected and should not be reachable from the public internet rather than treated as ordinary traffic.
The registration is dual: 552/tcp carries the same devshr-nts/DeviceShare name, and both the Reference and Registration Date fields are blank in the IANA registry. No RFC or specification documents what the DeviceShare service is meant to do, and the assignee on record is Benjamin_Rosenberg.
Community port-reference sites — SpeedGuide, AuditMyPC, and Internet-Security.com — list only the bare IANA registration for port 552 and report no user-submitted sightings of real software or traffic tied to it. No CVE, exploit, or malware family is recorded against the port as of an August 2026 search, and AuditMyPC's page for port 552 carries no trojan/virus flag.
Because the registered name has no known real-world implementation, secondary port-reference commentary treats any traffic observed on 552 as more likely a locally repurposed or custom service, a misconfiguration, or generic scan/probe noise, rather than the registered DeviceShare protocol itself. The nmap-services corpus records a measured open-frequency of 0.00084 (about 0.084%) for 552/udp — a low but genuine sampled reading, not an assumed absence.
- Exposure
- Anomalous — no known application implements devshr-nts/DeviceShare, so an open 552/udp should be investigated rather than assumed routine.
- IANA reference
- blank in the registry — no RFC or specification backs this assignment.
- Malware/CVE
- none recorded as of an August 2026 search; AuditMyPC's port 552 page carries no trojan/virus flag (cited as a negative finding only).
- Likely explanation for traffic
- port-reference commentary treats observed traffic as more likely a repurposed/custom service, misconfiguration, or scan noise than the registered protocol.
- IANA assignment
devshr-nts— "DeviceShare"; reference (blank); assignee Benjamin_Rosenberg; dual-registered 552/tcp + 552/udp [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry devshr-nts 552/udp- Range class
- well-known (0–1023) [Confirmed] — this site's own tooling
- Prevalence
- nmap-services open-frequency 552/udp = 0.00084 (~0.084%); 552/tcp = 0.000013 (~0.0013%) [Confirmed] — this site's own tooling
- Related ports
- 552/tcp (same devshr-nts/DeviceShare dual registration)
Primary use
registered name devshr-nts/DeviceShare; no RFC, specification, or documented implementation found as of an August 2026 search [Likely] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv, https://www.auditmypc.com/tcp-port-552.asp
Other/unofficial uses
none found — no community sighting of software or traffic on this port surfaced
Security implications
essentially never legitimately open; no CVE or malware association found as of an August 2026 search; not flagged as trojan/virus-associated on AuditMyPC
Typically seen on
no known typical host type; a responsive 552/udp is an anomaly worth investigating [Unknown]
- Analyst note
- An open 552/udp is unusual because no known application implements the registered DeviceShare name — treat as a possible misconfiguration, repurposed service, or probe rather than routine traffic.
Service assignments.
| Name | Protocol | Description | Open frequency |
|---|---|---|---|
| deviceshare | UDP | — | 0.08% |
| deviceshare | TCP | devshr-nts | 0.00% |
Service assignments from the IANA Service Name and Transport Protocol Port Number Registry, with open-frequency data from nmap-services.