Robtex

Up: 192.251.12.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 192.251.13.0/25
Down right: 192.251.13.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.251.13.62	A+PTR	surfer.pjm.com
192.251.13.71	A+PTR	vendorsupport.pjm.com
192.251.13.86	PTR	connect.pjm.com
192.251.13.91	A+PTR	nsinet101.pjm.com
192.251.13.129	PTR	connect2.pjm.com
192.251.13.129	A	connect.pjm.com
192.251.13.131	A+PTR	esuite.pjm.com
192.251.13.132	PTR	ees.pjm.com
192.251.13.134	A+PTR	edarttrain.pjm.com
192.251.13.135	A	joatrain.pjm.com
192.251.13.136	A	cam.pjm.com
192.251.13.141	A+PTR	oasis.pjm.com
192.251.13.142	A	eftrtrain.pjm.com
192.251.13.145	A	emkttrn.pjm.com
192.251.13.146	A	rpmtrain.pjm.com
192.251.13.147	A	mediastream.pjm.com
192.251.13.148	A	egads.pjm.com
192.251.13.149	A	egadstrain.pjm.com
192.251.13.151	PTR	pjm.com
192.251.13.151	PTR	pjm.jobs
192.251.13.151	PTR	ftp.pjm.com
192.251.13.152	A+PTR	edata.pjm.com
192.251.13.159	A+PTR	face.pjm.com
192.251.13.160	A	edart.pjm.com
192.251.13.161	A	facetrain.pjm.com
192.251.13.162	A+PTR	joa.pjm.com
192.251.13.164	A	emergproc.pjm.com
192.251.13.168	A	oasisftppr.pjm.com
192.251.13.169	A+PTR	pjmoasis.pjm.com
192.251.13.171	A	msrs.pjm.com
192.251.13.174	PTR	isg.pjm.com
192.251.13.185	A	sftp.pjm.com
192.251.13.192	A	dataviewer.pjm.com
192.251.13.200	A	camtrain.pjm.com
192.251.13.201	A+PTR	smtp1.pjm.com
192.251.13.202	A+PTR	smtp2.pjm.com
192.251.13.207	A	marketsgateway.pjm.com
192.251.13.209	A	esuitetrain.pjm.com
192.251.13.210	A	gis.pjm.com
192.251.13.221	A+PTR	lists.pjm.com
192.251.13.222	A+PTR	smtp.pjm.com
192.251.13.223	A+PTR	oasistrain.pjm.com
192.251.13.224	A	jcmramp.pjm.com
192.251.13.225	A	msrstrain.pjm.com
192.251.13.234	A	lrstrain.pjm.com
192.251.13.238	PTR	gis.pjm.com
192.251.13.240	A	emkt.pjm.com
192.251.13.241	A+PTR	eestrain.pjm.com
192.251.13.248	A	ftctrain.pjm.com
192.251.13.253	A	mod.pjm.com