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UDP 626

ProtocolUDP
Port626
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Synopsis

  • UDP port 626 is registered for serialnumberd, an Apple Mac OS X Server service.
  • Older Mac OS X Server releases (e.g., 10.2–10.5) ran serialnumberd on UDP 626 to handle server serial/registration queries used by Apple Server Admin and setup tools on the local network.
  • Network scans of legacy macOS Server installations commonly identify 626/udp as serialnumberd (e.g., in nmap service fingerprints).
  • The service is largely obsolete today as Apple has deprecated macOS Server features, so modern systems rarely use UDP 626.

Observed activity

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