Robtex

Up: 199.36.80.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 199.36.84.0/23
Down right: 199.36.86.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
199.36.84.32	PTR	199-36-84-32.static-ip.telepacific.net
199.36.84.154	PTR	199-36-84-154.static-ip.telepacific.net
199.36.84.154	A	mail.bamtuff.com
199.36.84.154	A	mail.richltd.com
199.36.85.138	A+PTR	mail.sunmclaw.com
199.36.85.139	A+PTR	199-36-85-139.static-ip.telepacific.net
199.36.86.53	PTR	199-36-86-53.static-ip.telepacific.net
199.36.86.99	PTR	199-36-86-99.static-ip.telepacific.net
199.36.86.99	A	impactserver.net
199.36.86.139	A+PTR	remote.vpointlabs.com
199.36.87.10	A	mail.ngap.com
199.36.87.11	PTR	smtp.ngap.com
199.36.87.11	PTR	smtp.ngapinc.com
199.36.87.15	PTR	smtp.myngap.com
199.36.87.15	A	smtp1.myngap.com
199.36.87.16	A	team.ngap.com
199.36.87.19	A	marvinsupply.com
199.36.87.20	A	mail.marvinsupply.com
199.36.87.21	PTR	199-36-87-21.static-ip.telepacific.net
199.36.87.21	A	smtp.ngap.com
199.36.87.21	A	smtp.ngapinc.com
199.36.87.24	PTR	199-36-87-24.static-ip.telepacific.net
199.36.87.25	A	smtp.hmsonline.us
199.36.87.25	A	smtp1.primes4providers.com
199.36.87.36	A	mail.nielsencc.com
199.36.87.84	A+PTR	199-36-87-84.static-ip.telepacific.net
199.36.87.88	A+PTR	199-36-87-88.static-ip.telepacific.net
199.36.87.88	A	smtp2.digirad.com
199.36.87.194	PTR	199-36-87-194.static-ip.telepacific.net
199.36.87.194	A	sdmail10.ecisandiego.com
199.36.87.194	A	ecisandiego.com