Robtex

Up: 81.78.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 81.78.0.0/18
Down right: 81.78.64.0/18

IP	Type	Hostname
81.78.5.2	PTR	modem-1282.alligator.dialup.pol.co.uk
81.78.11.2	PTR	modem-2818.alligator.dialup.pol.co.uk
81.78.16.2	PTR	modem-2.baboon.dialup.pol.co.uk
81.78.17.2	PTR	modem-258.baboon.dialup.pol.co.uk
81.78.19.2	PTR	modem-770.baboon.dialup.pol.co.uk
81.78.21.2	PTR	modem-1282.baboon.dialup.pol.co.uk
81.78.27.2	PTR	modem-2818.baboon.dialup.pol.co.uk
81.78.28.2	PTR	modem-3074.baboon.dialup.pol.co.uk
81.78.32.2	PTR	modem-2.crocodile.dialup.pol.co.uk
81.78.32.3	PTR	modem-3.crocodile.dialup.pol.co.uk
81.78.32.67	PTR	modem-67.crocodile.dialup.pol.co.uk
81.78.34.2	PTR	modem-514.crocodile.dialup.pol.co.uk
81.78.36.2	A+PTR	modem-1026.crocodile.dialup.pol.co.uk
81.78.39.2	PTR	modem-1794.crocodile.dialup.pol.co.uk
81.78.49.42	PTR	modem-298.dasyure.dialup.pol.co.uk
81.78.64.97	PTR	modem-97.gazelle.dialup.pol.co.uk
81.78.64.99	PTR	modem-99.gazelle.dialup.pol.co.uk
81.78.64.187	PTR	modem-187.gazelle.dialup.pol.co.uk
81.78.68.1	PTR	modem-1025.gazelle.dialup.pol.co.uk
81.78.68.129	PTR	modem-1153.gazelle.dialup.pol.co.uk
81.78.68.130	PTR	modem-1154.gazelle.dialup.pol.co.uk
81.78.68.131	PTR	modem-1155.gazelle.dialup.pol.co.uk
81.78.69.79	PTR	modem-1359.gazelle.dialup.pol.co.uk
81.78.71.156	PTR	modem-1948.gazelle.dialup.pol.co.uk
81.78.71.160	PTR	modem-1952.gazelle.dialup.pol.co.uk
81.78.79.30	PTR	modem-3870.gazelle.dialup.pol.co.uk
81.78.85.106	PTR	modem-1386.giraffe.dialup.pol.co.uk
81.78.92.137	PTR	modem-3209.giraffe.dialup.pol.co.uk
81.78.110.59	PTR	modem-3643.gorilla.dialup.pol.co.uk