From ClueWiki

Official Servers

Server	Owner	Purpose	SSH?
Abscissa.cluenet.org	Cobi	Shell Server / General Use	Port 22222 (IPv4) Port 22 (IPv6)
Absval.cluenet.org	Crispy	UML Server (ClueVPS)	Port 22
Arbelos.cluenet.org	f0ner00t	Shell/ IRC Server	Port 22
Axiom.cluenet.org	Crazytales	Shell Server	Port 22002 or Port 443 (IPv6 only)
Centroid.cluenet.org	Santium	IRC Server, Shell Server	Port 22 IPv4 & IPv6
Cosine.cluenet.org	Crispy	Testing Server	Contact Crispy
Delta.cluenet.org	methecooldude	Shell Server	Port 22 / 22222
Euclid.cluenet.org	Cobi	DNS Server	Not accessible
Fractal.cluenet.org	Crazytales	Shell Server, web server	Port 22000 / 443 (IPv4, IPv6)
Gauss.cluenet.org	Crispy	None at this time	Not accessible
Induction.cluenet.org	Crispy	Mail Server	Not accessible
Newton.cluenet.org	Crispy	Shell Server / General Use	Port 22
Ordinate.cluenet.org	Cobi	Shell Server	Port 2999 (IPv4) Port 22 (IPv6)
Pascal.cluenet.org	Crispy	None at this time	Port 22
Phi.cluenet.org	Cobi	LDAP Failover	Not accessible
Pi.cluenet.org	Cobi	Shell Server	Port 29292 (IPv4) Port 22 (IPv6)
Pythagoras.cluenet.org	Jared	Shell Server	Port 22
Radian.cluenet.org	Crispy	Primary account server, Web server	Not accessible
Scalar.cluenet.org	davenull	Shell Server, Webserver	Port 22
Sigma.cluenet.org	lee	Shell Server	Port 22
Theta.cluenet.org	Cobi	IRC Server, Hub, ClueTun.	Not accessible
Vector.cluenet.org	tonyb	Shell Server, Web server, MySql Server, IRC Server (Just about everything)	Port 22

Unofficial Servers

Server	Admin	Purpose	SSH?
Mobius.cluenet.org	cybojanek	Shell Server	Port 22 and 443
Rubik.cluenet.org	wildrover	Shell Server, Web Server, BitlBee Server	Port 22, ClueTerm
Googol.cluenet.org	komik	Shell Server, Web Server, Web Desktop	Port 22 and 443