Robtex

Up: 207.172.80.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 207.172.88.0/22
Down right: 207.172.92.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
207.172.88.0	A+PTR	207-172-88-0.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.88.1	A+PTR	207-172-88-1.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.88.1	A	bdl1.grg-cbr2.lnh-grg.md.cable.rcn.net
207.172.89.5	A+PTR	207-172-89-5.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.89.48	A+PTR	207-172-89-48.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.89.112	A+PTR	207-172-89-112.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.89.117	A+PTR	207-172-89-117.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.89.197	A	mail2.kristinandjohnaregettingmarried.com
207.172.89.197	A	mail2.areagroups.com
207.172.89.197	A	mail.areagroups.com
207.172.90.28	A+PTR	207-172-90-28.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.90.43	PTR	207-172-90-43.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.90.43	A	gotsprings.net
207.172.90.156	A+PTR	207-172-90-156.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.90.231	A+PTR	207-172-90-231.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.91.107	A+PTR	207-172-91-107.s2921.c3-0.grg-cbr2.lnh-grg.md.cable.rcncustomer.com
207.172.92.173	A+PTR	207-172-92-173.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.93.121	A	207-172-93-121.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.93.214	PTR	207-172-93-214.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.94.64	PTR	207-172-94-64.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.95.46	A+PTR	207-172-95-46.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.95.108	A+PTR	207-172-95-108.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com
207.172.95.131	A+PTR	207-172-95-131.c3-0.grg-ubr2.lnh-grg.md.cable.rcn.com