Robtex

Up: 194.50.54.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 194.50.55.0/25
Down right: 194.50.55.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
194.50.55.12	PTR	sip2sip.net
194.50.55.12	A	sip4u.co.uk
194.50.55.12	A	sip.sip2sip.net
194.50.55.13	A+PTR	voicemail1.sip2sip.net
194.50.55.14	A	voicemail2.sip2sip.net
194.50.55.14	A	mx0.tabaksofort.com
194.50.55.15	A+PTR	ns2.ntaltd.co.uk
194.50.55.15	A	ns2.sip2sip.net
194.50.55.15	A	ntp.sip2sip.net
194.50.55.16	A+PTR	web.sip2sip.net
194.50.55.16	A	mail.worldofvoip.net
194.50.55.16	A	*.computecuk.net
194.50.55.17	A+PTR	ns1.ntaltd.co.uk
194.50.55.18	A+PTR	db.sip2sip.net
194.50.55.19	A+PTR	fs.sip2sip.net
194.50.55.47	A+PTR	db1.sip2sip.net
194.50.55.48	A	db2.sip2sip.net