Robtex

Up: 192.55.82.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 192.55.83.0/25
Down right: 192.55.83.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.55.83.1	A	gw.m.nstld.com
192.55.83.9	A	vrrp.m.nstld.com
192.55.83.10	A	igw1.m.nstld.com
192.55.83.11	A	igw2.m.nstld.com
192.55.83.30	A+PTR	m.gtld-servers.net
192.55.83.30	A	m.edu-servers.net
192.55.83.30	A	usaclassified.net
192.55.83.31	PTR	m2.nstld.com
192.55.83.32	A+PTR	m3.nstld.com
192.55.83.32	A	basil.arin.net
192.55.83.33	PTR	m4.nstld.com
192.55.83.34	PTR	m5.nstld.com
192.55.83.35	PTR	m6.nstld.com
192.55.83.36	PTR	m7.nstld.com
192.55.83.37	PTR	m8.nstld.com
192.55.83.38	PTR	m9.nstld.com
192.55.83.39	A+PTR	m10.nstld.com
192.55.83.120	PTR	m-netmap.gtld-servers.net