475

Port 475/tcp carries tcpnethaspsrv, the TCP/IP variant of Aladdin Knowledge Systems' NetHASP License Manager, and it should stay internal-only rather than face the public internet. It is a hardware-dongle license server, not a general-purpose network service, and has no legitimate reason to be reachable from outside a trusted LAN.

IANA registers 475/tcp (and 475/udp) as tcpnethaspsrv, assigned to Michael Zunke, with a blank Reference column and a registration date of 2010-07-23. NetHASP lets client software query a HASP hardware-dongle license server over a network instead of requiring a locally attached dongle — a common copy-protection scheme for commercial CAD, industrial, and engineering software. Aladdin Knowledge Systems was later acquired by SafeNet, itself later acquired by Gemalto, now part of Thales.

The nmap-services corpus records this port as rarely open: 475/tcp shows an open-frequency of 0.000138 (~0.014%) and 475/udp 0.000643 (~0.064%), consistent with a niche, mostly LAN-internal licensing daemon rather than an internet-facing one.

No CVE specific to tcpnethaspsrv/NetHASP turned up in an August 2026 search of the sources checked, and AuditMyPC's port-475 page carries no trojan/virus verdict line at all — an absence of evidence rather than a documented clean bill.

IANA assignment

tcpnethaspsrv — description "tcpnethaspsrv"; assignee Michael Zunke; reference column blank; registered 2010-07-23; dual-registered 475/tcp + 475/udp [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry tcpnethaspsrv 475/tcp

Range class

system/well-known (0–1023) [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry tcpnethaspsrv 475/tcp

Prevalence

nmap-services/port-data.json open-frequency 475/tcp = 0.000138 (~0.014%); 475/udp = 0.000643 (~0.064%) [Confirmed] — this site's own tooling (port 475)

Related ports

475/udp (same service, dual-registered); other licensing-daemon ports in the system range

Primary use

NetHASP License Manager (TCP/IP), Aladdin Knowledge Systems HASP hardware-dongle licensing over a network

Other/unofficial uses

none surfaced beyond the HASP/NetHASP ecosystem in this search [Unknown]

Security implications

no port-475-specific CVE found as of August 2026; no explicit malware/trojan verdict on AuditMyPC's port-475 page (absence, not a clean-bill statement); generic guidance favors restricting access rather than internet exposure

Typically seen on

hosts running commercial CAD/industrial/engineering software with HASP dongle-based licensing, on internal/LAN license servers

Analyst note

An open port 475 outside a known licensing-server context is worth confirming against inventory rather than assuming malicious intent — the service is legitimate but legacy and niche.

Port 475/udp carries tcpnethaspsrv, the network component of the Aladdin/SafeNet HASP (Hardware Against Software Piracy) license-manager system; it should stay internal-only rather than face the public internet. IANA registers the name on both 475/tcp and 475/udp with a blank Reference column, assignee Michael Zunke, registered 2010-07-23.

Vendor and community documentation ties the port to legacy "HASP License Manager" / NetHASP network dongle licensing, which lets client machines validate a floating software license over IP instead of requiring a local hardware dongle. This is a decades-old licensing mechanism from Aladdin Knowledge Systems, later folded into SafeNet and then Gemalto/Thales.

Firewall guidance from at least two independent commercial-software vendors instructs opening TCP and UDP 475 for their license servers, which corroborates the IANA assignment as a still-referenced (if legacy) LAN service rather than an abandoned registration. No CVE tied to a service on port 475 is recorded in the NVD as of 2026-08, and no malware or trojan association was found in an August 2026 search.

IANA assignment

tcpnethaspsrv — description "tcpnethaspsrv"; reference (blank); assignee Michael_Zunke; dual-registered 475/tcp + 475/udp, registered 2010-07-23 [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry tcpnethaspsrv 475/udp

Range class

system/well-known-adjacent (registered range) [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry tcpnethaspsrv 475/udp

Prevalence

nmap-services open-frequency 475/udp = 0.000643; 475/tcp = 0.000138 (measured from this site's own tooling) [Confirmed] — this site's own tooling

Related ports

475/tcp (paired registration for the same service); 1947/tcp (modern Sentinel HASP driver port used by some of the same vendor ecosystem)

Primary use

network component of the Aladdin/SafeNet HASP license-manager system, letting clients verify a floating/network HASP (NetHASP) license dongle over IP

Other/unofficial uses

none documented beyond the HASP/NetHASP licensing family [Unknown]

Security implications

legacy LAN-only license-manager service; no CVE or malware association located as of 2026-08

Typically seen on

hosts running commercial software with HASP/NetHASP-protected licensing (e.g. metrology, CAD/engineering, ERP tooling referencing HASP LM)

Analyst note

An externally reachable 475/udp is atypical for a service meant to stay within a licensing LAN — verify it isn't unintentionally exposed rather than assume it's benign.