algunos dns

$ host  200.23.242.193

193.242.23.200.in-addr.arpa domain name pointer nsgdl1.uninet.net.mx.

$ host  200.33.146.209

209.146.33.200.in-addr.arpa domain name pointer nsmex3.uninet.net.mx.

$ host 200.23.242.201

201.242.23.200.in-addr.arpa domain name pointer nsgdl2.uninet.net.mx.

$ host 200.33.146.217

217.146.33.200.in-addr.arpa domain name pointer nsmex4.uninet.net.mx.

$ host 219.127.89.34

34.89.127.219.in-addr.arpa is an alias for 34.net32.89.127.219.in-addr.arpa.

34.net32.89.127.219.in-addr.arpa domain name pointer ns1.shimpinomori.net.

por probar:

#UNAM

132.248.10.2

132.248.204.1

132.248.64.250

132.248.237.250

#PRODIGY

200.33.146.193

200.33.146.201

200.33.146.209

200.33.146.217

#AVANTEL

148.240.241.9

148.240.241.41

#ZONEEDIT

209.126.159.80

216.122.4.160

#REDIRIS

130.206.1.39

130.206.1.2

130.206.1.3

200.36.1.204 ; Cofrade

69.93.121.178 ; Charanda