Robtex

Up: 77.73.80.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 77.73.80.0/25
Down right: 77.73.80.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
77.73.80.0	A+PTR	host0.80.icmnetsystems.com
77.73.80.1	PTR	host1.80.icmnetsystems.com
77.73.80.2	PTR	host2.80.icmnetsystems.com
77.73.80.3	PTR	host3.80.icmnetsystems.com
77.73.80.4	A+PTR	host4.80.icmnetsystems.com
77.73.80.5	A+PTR	host5.80.icmnetsystems.com
77.73.80.6	PTR	host6.80.icmnetsystems.com
77.73.80.7	PTR	host7.80.icmnetsystems.com
77.73.80.8	A+PTR	host8.80.icmnetsystems.com
77.73.80.9	PTR	host9.80.icmnetsystems.com
77.73.80.10	A+PTR	ns1.icmnetsystems.com
77.73.80.10	A	host10.80.icmnetsystems.com
77.73.80.10	A	dns1.vasava.es
77.73.80.11	PTR	host11.80.icmnetsystems.com
77.73.80.12	PTR	host12.80.icmnetsystems.com
77.73.80.13	A+PTR	ns2.icmnetsystems.com
77.73.80.13	A	host13.80.icmnetsystems.com
77.73.80.13	A	dns2.vasava.es
77.73.80.14	A+PTR	host14.80.icmnetsystems.com
77.73.80.15	A+PTR	host15.80.icmnetsystems.com
77.73.80.16	PTR	host16.80.icmnetsystems.com
77.73.80.17	PTR	host17.80.icmnetsystems.com
77.73.80.18	A+PTR	host18.80.icmnetsystems.com
77.73.80.18	A	mail.icmnetsystems.com
77.73.80.19	A+PTR	host19.80.icmnetsystems.com
77.73.80.20	PTR	host20.80.icmnetsystems.com
77.73.80.20	A	cloud-publica.com
77.73.80.20	A	educamundohuelva.es
77.73.80.22	PTR	host22.80.icmnetsystems.com
77.73.80.22	A	mail.laslomasvillage.com
77.73.80.22	A	mail.presupuesto-vmware.com
77.73.80.24	PTR	host24.80.icmnetsystems.com
77.73.80.32	A+PTR	host32.80.icmnetsystems.com
77.73.80.41	PTR	host41.80.icmnetsystems.com
77.73.80.43	A+PTR	host43.80.icmnetsystems.com
77.73.80.43	A	mail-secure.icmnetsystems.com
77.73.80.43	A	mail-secure2.icmnetsystems.com
77.73.80.44	A	asce01-node01.icm.es
77.73.80.48	PTR	host48.80.icmnetsystems.com
77.73.80.63	A+PTR	host63.80.icmnetsystems.com
77.73.80.64	A+PTR	host64.80.icmnetsystems.com
77.73.80.65	PTR	host65.80.icmnetsystems.com
77.73.80.65	A	atuservicio24horas.com
77.73.80.65	A	atuservicio24h.com
77.73.80.66	A	host66.80.icmnetsystems.com
77.73.80.67	PTR	host67.80.icmnetsystems.com
77.73.80.68	A	mail.ogilvyone.es
77.73.80.68	A	mail.shandycruzcampo.com
77.73.80.68	A	mail.shandycruzcampo.net
77.73.80.69	PTR	host69.80.icmnetsystems.com
77.73.80.69	A	lahinchadadelaseleccion.es
77.73.80.73	A	www.ronaldinhogaucho.com
77.73.80.74	PTR	host74.80.icmnetsystems.com
77.73.80.77	A	host77.80.icmnetsystems.com
77.73.80.91	PTR	host91.80.icmnetsystems.com
77.73.80.91	A	tiguan.es
77.73.80.92	PTR	host92.80.icmnetsystems.com
77.73.80.93	A	tribal-lnx01.icmnetsystems.com
77.73.80.101	PTR	host101.80.icmnetsystems.com
77.73.80.112	A+PTR	host112.80.icmnetsystems.com
77.73.80.112	A	nauta-lnx2.icmnetsystems.com
77.73.80.112	A	isalucena.es
77.73.80.114	PTR	host114.80.icmnetsystems.com
77.73.80.115	PTR	host115.80.icmnetsystems.com
77.73.80.119	A+PTR	host119.80.icmnetsystems.com
77.73.80.123	PTR	host123.80.icmnetsystems.com
77.73.80.142	A	mail.momoom.com
77.73.80.144	A	laslomasvillage.com
77.73.80.145	PTR	host145.80.icmnetsystems.com
77.73.80.147	PTR	host147.80.icmnetsystems.com
77.73.80.148	PTR	host148.80.icmnetsystems.com
77.73.80.156	A+PTR	host156.80.icmnetsystems.com
77.73.80.174	PTR	host174.80.icmnetsystems.com
77.73.80.176	PTR	host176.80.icmnetsystems.com
77.73.80.177	PTR	host177.80.icmnetsystems.com
77.73.80.186	PTR	host186.80.icmnetsystems.com
77.73.80.218	PTR	host218.80.icmnetsystems.com
77.73.80.224	PTR	host224.80.icmnetsystems.com
77.73.80.246	PTR	host246.80.icmnetsystems.com
77.73.80.255	PTR	host255.80.icmnetsystems.com