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TCP 81

ProtocolTCP
Port81
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Synopsis

  • Blue Iris (Windows CCTV/NVR software) runs its built-in web server on TCP port 81 by default for the HTTP interface.
  • Many embedded devices that use the GoAhead Web Server expose their admin panel on TCP 81; this is commonly seen on low-cost H.264/Xiongmai (XMeye) DVRs and some OEM IP cameras.
  • IANA assigns TCP/81 to the HOSTS2 Name Server (hosts2-ns), an obsolete service rarely encountered in modern networks.
  • Security note: IoT botnets such as Mirai and Mozi scan and attempt to brute-force/default-login HTTP interfaces on TCP 81 (along with 80/8080) because many embedded devices place their web admin there.

Observed activity

Last 30 days Detailed chart

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