Robtex

Up: 198.51.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 198.51.44.0/23
Down right: 198.51.46.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
198.51.44.1	PTR	dns1.p01.nsone.net
198.51.44.1	A	dns1.p01.d.section.io
198.51.44.1	A	ns1.marsble.com
198.51.44.2	PTR	dns1.p02.nsone.net
198.51.44.3	PTR	dns1.p03.nsone.net
198.51.44.4	A+PTR	dns1.p04.nsone.net
198.51.44.4	A	pantek-scrues.com
198.51.44.4	A	dns1.p04.d.section.io
198.51.44.5	PTR	dns1.p05.nsone.net
198.51.44.6	PTR	dns1.p06.nsone.net
198.51.44.7	PTR	dns1.p07.nsone.net
198.51.44.8	A+PTR	dns1.p08.nsone.net
198.51.44.8	A+PTR	ns8.demysdns.com
198.51.44.8	A	dns1.p08.d.section.io
198.51.44.9	PTR	dns1.p09.nsone.net
198.51.44.9	PTR	ns4.demysdns.co.uk
198.51.44.9	A	ns5.pinterest.com
198.51.44.10	PTR	dns1.p10.nsone.net
198.51.44.65	PTR	dns3.p01.nsone.net
198.51.44.65	A	ns19090.1slb.org
198.51.44.65	A	ns3.marsble.net
198.51.44.66	PTR	dns3.p02.nsone.net
198.51.44.66	A	ns11.sunhostbd.com
198.51.44.67	PTR	dns3.p03.nsone.net
198.51.44.67	A	ns11.sunhostbd.com
198.51.44.68	A+PTR	dns3.p04.nsone.net
198.51.44.68	A	ns11.sunhostbd.com
198.51.44.69	PTR	dns3.p05.nsone.net
198.51.44.69	A	ep1ns03.mckesson.org
198.51.44.69	A	dns3.p05.d.section.io
198.51.44.70	PTR	dns3.p06.nsone.net
198.51.44.71	PTR	dns3.p07.nsone.net
198.51.44.72	A+PTR	dns3.p08.nsone.net
198.51.44.72	A	ns03.firstcitizens.com
198.51.44.72	A	dns3.p08.d.section.io
198.51.44.73	PTR	dns3.p09.nsone.net
198.51.44.73	PTR	ns6.demysdns.co.uk
198.51.44.73	A	dns3.global01.nsone.net.cn
198.51.44.74	PTR	dns3.p10.nsone.net
198.51.45.1	PTR	dns2.p01.nsone.net
198.51.45.1	A	ns19090.1slb.org
198.51.45.1	A	ns20001.1slb.org
198.51.45.2	PTR	dns2.p02.nsone.net
198.51.45.2	A	ns9.sunhostbd.com
198.51.45.3	PTR	dns2.p03.nsone.net
198.51.45.3	A	ns9.sunhostbd.com
198.51.45.4	A+PTR	dns2.p04.nsone.net
198.51.45.4	A	ns9.sunhostbd.com
198.51.45.4	A	dns2.p04.d.section.io
198.51.45.5	PTR	dns2.p05.nsone.net
198.51.45.5	A	ep1ns02.mckesson.net
198.51.45.5	A	ns10.sunhostbd.com
198.51.45.6	PTR	dns2.p06.nsone.net
198.51.45.6	A	ns10.sunhostbd.com
198.51.45.7	PTR	dns2.p07.nsone.net
198.51.45.7	A	ns10.sunhostbd.com
198.51.45.8	A+PTR	dns2.p08.nsone.net
198.51.45.8	A	dns2.p08.d.section.io
198.51.45.8	A	ns10.sunhostbd.com
198.51.45.9	PTR	dns2.p09.nsone.net
198.51.45.9	A	dns2.p09.ns1global.org
198.51.45.10	PTR	dns2.p10.nsone.net
198.51.45.65	A+PTR	dns4.p01.nsone.net
198.51.45.65	A	ns19090.1slb.org
198.51.45.65	A	ns20001.1slb.org
198.51.45.66	PTR	dns4.p02.nsone.net
198.51.45.67	PTR	dns4.p03.nsone.net
198.51.45.68	A+PTR	dns4.p04.nsone.net
198.51.45.68	A	pantek-scrues.com
198.51.45.68	A	dns4.p04.d.section.io
198.51.45.69	PTR	dns4.p05.nsone.net
198.51.45.70	PTR	dns4.p06.nsone.net
198.51.45.71	PTR	dns4.p07.nsone.net
198.51.45.72	A+PTR	dns4.p08.nsone.net
198.51.45.72	A	dns4.p08.d.section.io
198.51.45.73	A+PTR	dns4.p09.nsone.net
198.51.45.73	PTR	ns7.demysdns.com
198.51.45.73	A	dns1.bbc.com
198.51.45.74	PTR	dns4.p10.nsone.net