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Search TCP / UDP Port Assignment Database

Enter port number or text string:
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Search result for: 661

From: [IANA] [NMAP] [SANS]

Service Port Prot. Description Notes
hap 661 tcp HAP [IANA]
hap 661 udp HAP [IANA]
hap 661 tcp # HAP [NMAP]
hap 661 tcp HAP [SANS]
NokNok 661 tcp (trojan) NokNok [SANS]
hap 661 udp HAP [SANS]

How to use:

To search by port enter a number in the range between 0 and 65535. To search service / protocol description by keyword enter a text string at least three characters long. Wild-card (*) is supported if it is the last character in the search string. Alternatively, select a port from one of the ranges listed below.

0-1023 - Well-known or System Ports
1024-49151 - Registered or User Ports
49152-65535 - Dynamic/Private or Ephemeral Ports

Information Sources:
[IANA]  IANA Service Name and Transport Protocol Port Number Registry
[NMAP]  NMAP.org well known service port numbers
[WG]  WintelGuy.com port number database compiled from many different sources, including Microsoft, VMWare, Citrix, Oracle, etc.
[WP] Wikipedia - List of TCP and UDP port numbers
[SANS]  SANS Inst. / DShield service list