Which software uses port 666 officially?

[hk10Mbps]

 

[Electrode]

Quake 1, if I remember correctly

 

[Skyclad1uhm1]

Originally posted by: Electrode
Quake 1, if I remember correctly

Doom

Edit: Hint: In Google search for 'services port <nr>'

 

[FeathersMcGraw]

Originally posted by: Skyclad1uhm1

Doom

Excellent. They're even acknowledged by IANA in the well-known port number list.

 

[n0cmonkey]

Doom. /etc/services or c:\services or check IANA