Robtex

Up: 204.62.112.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 204.62.114.0/24
Down right: 204.62.115.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
204.62.114.13	A+PTR	mail-relay-01.backpackit.com
204.62.114.16	A	mail-relay-04.backpackit.com
204.62.114.18	A+PTR	mail-relay-01.basecamphq.com
204.62.114.35	A	mail-relay-03.writeboard.com
204.62.114.37	PTR	mail-relay-01.3.basecamp.com
204.62.114.37	A	singlefile.com
204.62.114.38	A+PTR	mail-relay-02.3.basecamp.com
204.62.114.39	A+PTR	mail-relay-03.3.basecamp.com
204.62.114.61	A	www.haystack.com
204.62.114.61	A	haystack.com
204.62.114.63	A	chat.37signals.com
204.62.114.66	PTR	highrisehq.com
204.62.114.67	A+PTR	campfirenow.com
204.62.114.67	A	campfire-staging.com
204.62.114.67	A	www.campfirenow.com
204.62.114.68	A+PTR	mail-relay-01.basecamphq.com
204.62.114.90	A+PTR	mail-relay-01.basecamp.com
204.62.114.91	A+PTR	mail-relay-01.basecamphq.com
204.62.114.92	A+PTR	mail-relay-02.basecamp.com
204.62.114.94	A+PTR	mail-relay-03.basecamp.com
204.62.114.96	PTR	basecamp.com
204.62.114.102	A	mail-relay-04.basecamp.com
204.62.114.103	A+PTR	mail-relay-04.3.basecamp.com
204.62.114.105	PTR	mail-relay-02.knowyourcompany.com
204.62.114.105	A	mail-relay-05.basecamp.com
204.62.114.106	A	mail-relay-05.3.basecamp.com
204.62.114.108	A+PTR	beta1.37img.com
204.62.114.109	A	weworkremotely.com
204.62.114.111	A+PTR	help.basecamp.com
204.62.114.111	A	help-basecamp.37signals.com
204.62.114.116	A+PTR	signalvnoise.com
204.62.114.116	A	www.signalvnoise.com
204.62.114.117	A	thedistance.com
204.62.114.119	A+PTR	beta1.3.basecamp.com
204.62.114.120	A+PTR	origin.basecamp-static.com
204.62.114.125	A	rollout.3.basecamp.com
204.62.114.176	A+PTR	progress.basecamp.com
204.62.114.177	A+PTR	search.basecamp.com
204.62.114.178	A+PTR	dash.37signals.com
204.62.114.179	A+PTR	37signals.com
204.62.114.179	A	infrastructure-vhost-k1.37signals.com
204.62.114.179	A	lbcc01.37signals.com
204.62.114.180	A+PTR	basecamp.com
204.62.114.181	PTR	wildcard.basecamp.com
204.62.114.181	A	beta5.basecamp.com
204.62.114.181	A	public.basecamp.com
204.62.114.182	PTR	wildcard.backpackit.com
204.62.114.182	A	benw.backpackit.com
204.62.114.182	A	assets.backpackit.com
204.62.114.183	PTR	wildcard.campfirenow.com
204.62.114.185	A	123.writeboard.com
204.62.114.186	A	sys.tadalist.com
204.62.114.186	A	rsusan.tadalist.com
204.62.114.186	A	joeusa.tadalist.com
204.62.114.188	PTR	wildcard.basecamphq.com
204.62.114.188	A	markenkonstrukt.basecamphq.com
204.62.114.188	A	dmaa.basecamphq.com
204.62.114.190	A+PTR	wildcard.grouphub.com
204.62.114.190	A	*.grouphub.com
204.62.114.190	A	lifestagemedia.grouphub.com
204.62.114.191	PTR	wildcard.projectpath.com
204.62.114.192	PTR	wildcard.seework.com
204.62.114.192	A	basecamp-assets.seework.com
204.62.114.192	A	37signals.seework.com
204.62.114.194	PTR	wildcard.highrisehq.com
204.62.114.194	A	37signals.highrisehq.com
204.62.114.194	A	boxclever.highrisehq.com
204.62.114.197	A+PTR	champagne.37signals.com
204.62.114.198	A+PTR	blogcabin.37signals.com
204.62.114.199	A	*.breeze123.com
204.62.114.200	A+PTR	launchpad.37signals.com
204.62.114.200	A	launchpad-asset0.37signals.com
204.62.114.200	A	suites.37signals.com
204.62.114.202	A	jobs.37signals.com
204.62.114.203	PTR	billing.37signals.com
204.62.114.203	A	affiliates.37signals.com
204.62.114.204	A+PTR	wildcard.suites.37signals.com
204.62.114.205	A+PTR	beta.basecamp.com
204.62.114.205	A	beta1.basecamp.com
204.62.114.205	A	rollout.basecamp.com
204.62.114.206	A+PTR	asset1.basecamp.com
204.62.114.207	A+PTR	launchpad-beta.37signals.com
204.62.114.210	A+PTR	app-mx.37signals.com
204.62.114.210	A	backpack-mx.37signals.com
204.62.114.210	A	mx.37signals.com
204.62.114.211	A+PTR	mx.basecamp.com
204.62.114.212	A	dev.37signals.com
204.62.114.219	A	37s.campfirenow.com
204.62.114.221	PTR	chef-ci.37signals.com
204.62.114.223	A+PTR	geminabox.37signals.com
204.62.114.227	A	smiley.basecamp.com
204.62.114.254	PTR	virt-gw.sc-chi.basecamp.com
204.62.115.2	PTR	rt-01.rw-ash-border.37signals.com
204.62.115.4	PTR	virt-fw.rw-ash-border.37signals.com
204.62.115.41	A+PTR	mail-relay-101.basecamp.com
204.62.115.42	A+PTR	mail-relay-102.basecamp.com
204.62.115.43	A+PTR	mail-relay-103.basecamp.com
204.62.115.44	A+PTR	mail-relay-104.basecamp.com
204.62.115.45	A+PTR	mail-relay-105.basecamp.com
204.62.115.51	A+PTR	mail-relay-101.3.basecamp.com
204.62.115.52	A+PTR	mail-relay-102.3.basecamp.com
204.62.115.53	A+PTR	mail-relay-103.3.basecamp.com
204.62.115.54	A+PTR	mail-relay-104.3.basecamp.com
204.62.115.55	A+PTR	mail-relay-105.3.basecamp.com
204.62.115.65	A+PTR	launchpad.37signals.com
204.62.115.66	PTR	highrisehq.com
204.62.115.67	A+PTR	campfirenow.com
204.62.115.76	A	bcx-staging.basecamp.com
204.62.115.76	A	m.basecamp.com
204.62.115.76	A	www.basecamp.com
204.62.115.78	PTR	basecamp.com
204.62.115.86	A	gopher.hey.com
204.62.115.88	A+PTR	37signals.com
204.62.115.88	A	answers.37signals.com
204.62.115.88	A	gettingreal.37signals.com
204.62.115.94	PTR	101a.trial.hey.com
204.62.115.104	A+PTR	dash.37signals.com
204.62.115.105	A+PTR	dash-test.37signals.com
204.62.115.109	A	billing.37signals.com
204.62.115.201	PTR	37img.com
204.62.115.211	A	mx.basecamp.com
204.62.115.228	A+PTR	mx.staging.basecamp.com
204.62.115.250	PTR	virt-gw.rw-ash.37signals.com