Robtex

Up: 80.254.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 80.254.16.0/22
Down right: 80.254.20.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
80.254.16.0	PTR	subnet0x4.16.piter-telecom.ru
80.254.16.2	A+PTR	ns1.piter-telecom.ru
80.254.16.66	PTR	finpost.16.piter-telecom.ru
80.254.16.81	A	schreinerei-baumann.ch
80.254.16.130	A+PTR	smtp.my-dom.spb.ru
80.254.16.130	A	mail.my-dom.spb.ru
80.254.16.142	A	relay.infostroy.ru
80.254.17.2	PTR	ns.piter-telecom.ru
80.254.17.2	A+PTR	relay.piter-telecom.ru
80.254.17.2	A	piter-telecom.tv
80.254.17.58	A+PTR	mail.alfa.ru
80.254.17.106	PTR	tilbury.ru
80.254.17.107	PTR	tilbury.ru
80.254.17.108	A	mx2.tilbury.ru
80.254.17.109	A	ns3.legirus.org
80.254.17.109	A	mx1.tilbury.ru
80.254.17.174	A	mail.yapteka.ru
80.254.17.255	PTR	bcast0x256.17.piter-telecom.ru
80.254.17.255	PTR	bcast252x4.17.piter-telecom.ru
80.254.18.0	PTR	subnet0x4.18.piter-telecom.ru
80.254.18.66	PTR	tksoft.18.piter-telecom.ru
80.254.18.66	A	office.interpress.ru
80.254.19.2	A+PTR	mail.avtsev.spb.ru
80.254.19.62	A	vqr.ca
80.254.19.62	A	mail.step-company.ru
80.254.19.62	A	mail.baltengsyst.ru
80.254.19.186	PTR	mastergambs.19.piter-telecom.ru
80.254.19.227	PTR	balthleb1.piter-telecom.ru
80.254.20.0	PTR	subnet0x4.20.piter-telecom.ru
80.254.20.70	A	mail.noviyostrov.ru
80.254.20.70	A	mail.rawheels.ru
80.254.20.70	A	mail.newkolomna.ru
80.254.20.126	A	spb.efimov-partners.ru
80.254.20.134	A	mail.poligon.info
80.254.20.178	A+PTR	mail.piter-center.ru
80.254.20.186	PTR	uknftehnology.20.piter-telecom.ru
80.254.20.186	A	mail.bowlingcity.ru
80.254.20.186	A	webmail.restoretto.ru
80.254.20.247	PTR	bcast240x8.20.piter-telecom.ru
80.254.20.248	PTR	subnet248x8.20.piter-telecom.ru
80.254.21.0	PTR	subnet0x4.21.piter-telecom.ru
80.254.21.86	A	mx1.indianconsulate.ru
80.254.21.134	A	ns1.krasstd.ru
80.254.22.246	A	www.piter-telecom.ru
80.254.22.246	A	piter-telecom.spb.ru
80.254.22.246	A	sobranie.biz
80.254.23.110	A	mail.indianconsulate.ru
80.254.23.163	PTR	spa-g-2.piter-telecom.ru