Robtex

Up: 81.73.64.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 81.73.64.0/20
Down right: 81.73.80.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.73.64.14	A+PTR	host14-64-static.73-81-b.business.telecomitalia.it
81.73.69.12	A	host12-69-static.73-81-b.business.telecomitalia.it
81.73.69.16	A	host16-69-static.73-81-b.business.telecomitalia.it
81.73.69.18	A	host18-69-static.73-81-b.business.telecomitalia.it
81.73.69.35	A+PTR	host35-69-static.73-81-b.business.telecomitalia.it
81.73.69.36	A	host36-69-static.73-81-b.business.telecomitalia.it
81.73.69.46	A	host46-69-static.73-81-b.business.telecomitalia.it
81.73.69.55	A	host55-69-static.73-81-b.business.telecomitalia.it
81.73.69.65	A+PTR	host65-69-static.73-81-b.business.telecomitalia.it
81.73.69.75	A	host75-69-static.73-81-b.business.telecomitalia.it
81.73.69.82	A	host82-69-static.73-81-b.business.telecomitalia.it
81.73.69.94	A	host94-69-static.73-81-b.business.telecomitalia.it
81.73.69.111	A	host111-69-static.73-81-b.business.telecomitalia.it
81.73.69.115	A	host115-69-static.73-81-b.business.telecomitalia.it
81.73.69.154	A	host154-69-static.73-81-b.business.telecomitalia.it
81.73.69.157	A	host157-69-static.73-81-b.business.telecomitalia.it
81.73.69.158	A	host158-69-static.73-81-b.business.telecomitalia.it
81.73.69.159	A	host159-69-static.73-81-b.business.telecomitalia.it
81.73.69.163	A+PTR	host163-69-static.73-81-b.business.telecomitalia.it
81.73.69.167	A	host167-69-static.73-81-b.business.telecomitalia.it
81.73.69.173	A	host173-69-static.73-81-b.business.telecomitalia.it
81.73.69.179	A	host179-69-static.73-81-b.business.telecomitalia.it
81.73.69.200	A	host200-69-static.73-81-b.business.telecomitalia.it
81.73.69.201	A	host201-69-static.73-81-b.business.telecomitalia.it
81.73.69.209	A	host209-69-static.73-81-b.business.telecomitalia.it
81.73.69.222	A	host222-69-static.73-81-b.business.telecomitalia.it
81.73.69.228	A	host228-69-static.73-81-b.business.telecomitalia.it
81.73.69.247	A	host247-69-static.73-81-b.business.telecomitalia.it
81.73.69.253	A	host253-69-static.73-81-b.business.telecomitalia.it
81.73.71.12	PTR	host12-71-static.73-81-b.business.telecomitalia.it
81.73.71.253	A	host253-71-static.73-81-b.business.telecomitalia.it
81.73.72.202	A+PTR	host202-72-static.73-81-b.business.telecomitalia.it
81.73.73.10	A+PTR	host10-73-static.73-81-b.business.telecomitalia.it
81.73.74.40	PTR	host40-74-static.73-81-b.business.telecomitalia.it
81.73.74.96	A+PTR	host96-74-static.73-81-b.business.telecomitalia.it
81.73.81.37	A	mail.connectisweb.it
81.73.81.37	A	mail.tuscanyhouse.net
81.73.81.37	A	mail.connectisweb.net
81.73.86.187	A	mail.centrolazio.net
81.73.86.187	A	host187-86-static.73-81-b.business.telecomitalia.it
81.73.87.4	A	www.ispave.it
81.73.87.5	PTR	host5-87-static.73-81-b.business.telecomitalia.it
81.73.87.5	A	ageinfo.it
81.73.87.5	A	www.ageinfo.it
81.73.88.31	A	host31-88-static.73-81-b.business.telecomitalia.it
81.73.88.86	A	host86-88-static.73-81-b.business.telecomitalia.it
81.73.88.94	A	host94-88-static.73-81-b.business.telecomitalia.it
81.73.88.100	A+PTR	host100-88-static.73-81-b.business.telecomitalia.it
81.73.88.124	A	host124-88-static.73-81-b.business.telecomitalia.it
81.73.88.137	A	host137-88-static.73-81-b.business.telecomitalia.it
81.73.88.144	A	host144-88-static.73-81-b.business.telecomitalia.it
81.73.88.154	A	host154-88-static.73-81-b.business.telecomitalia.it
81.73.88.155	A	host155-88-static.73-81-b.business.telecomitalia.it
81.73.88.171	A	host171-88-static.73-81-b.business.telecomitalia.it
81.73.88.175	A	host175-88-static.73-81-b.business.telecomitalia.it
81.73.88.203	A	host203-88-static.73-81-b.business.telecomitalia.it
81.73.88.206	A	host206-88-static.73-81-b.business.telecomitalia.it
81.73.88.223	A	host223-88-static.73-81-b.business.telecomitalia.it
81.73.88.227	A+PTR	host227-88-static.73-81-b.business.telecomitalia.it
81.73.88.228	A	host228-88-static.73-81-b.business.telecomitalia.it
81.73.88.229	A	host229-88-static.73-81-b.business.telecomitalia.it
81.73.88.231	A	host231-88-static.73-81-b.business.telecomitalia.it
81.73.90.35	A+PTR	host35-90-static.73-81-b.business.telecomitalia.it
81.73.91.6	A	host6-91-static.73-81-b.business.telecomitalia.it
81.73.91.11	A	host11-91-static.73-81-b.business.telecomitalia.it
81.73.91.16	A	host16-91-static.73-81-b.business.telecomitalia.it
81.73.91.18	A	host18-91-static.73-81-b.business.telecomitalia.it
81.73.91.35	A+PTR	host35-91-static.73-81-b.business.telecomitalia.it
81.73.91.39	A	host39-91-static.73-81-b.business.telecomitalia.it
81.73.91.48	A	host48-91-static.73-81-b.business.telecomitalia.it
81.73.91.51	A	host51-91-static.73-81-b.business.telecomitalia.it
81.73.91.69	A	host69-91-static.73-81-b.business.telecomitalia.it
81.73.91.72	A	host72-91-static.73-81-b.business.telecomitalia.it
81.73.91.73	A	host73-91-static.73-81-b.business.telecomitalia.it
81.73.91.85	A	host85-91-static.73-81-b.business.telecomitalia.it
81.73.91.103	A	host103-91-static.73-81-b.business.telecomitalia.it
81.73.91.104	A	host104-91-static.73-81-b.business.telecomitalia.it
81.73.91.106	A	host106-91-static.73-81-b.business.telecomitalia.it
81.73.91.107	A	host107-91-static.73-81-b.business.telecomitalia.it
81.73.91.135	A	host135-91-static.73-81-b.business.telecomitalia.it
81.73.91.141	A	host141-91-static.73-81-b.business.telecomitalia.it
81.73.91.148	A	host148-91-static.73-81-b.business.telecomitalia.it
81.73.91.156	A	host156-91-static.73-81-b.business.telecomitalia.it
81.73.91.163	A+PTR	host163-91-static.73-81-b.business.telecomitalia.it
81.73.91.175	A	host175-91-static.73-81-b.business.telecomitalia.it
81.73.91.178	A	host178-91-static.73-81-b.business.telecomitalia.it
81.73.91.191	A	host191-91-static.73-81-b.business.telecomitalia.it
81.73.91.197	A	host197-91-static.73-81-b.business.telecomitalia.it
81.73.91.202	A	host202-91-static.73-81-b.business.telecomitalia.it
81.73.91.216	A	host216-91-static.73-81-b.business.telecomitalia.it
81.73.91.237	A	host237-91-static.73-81-b.business.telecomitalia.it
81.73.91.251	A	host251-91-static.73-81-b.business.telecomitalia.it
81.73.91.253	A	host253-91-static.73-81-b.business.telecomitalia.it
81.73.95.135	PTR	host135-95-static.73-81-b.business.telecomitalia.it
81.73.95.173	A+PTR	host173-95-static.73-81-b.business.telecomitalia.it