Robtex

Up: 121.58.232.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 121.58.236.0/23
Down right: 121.58.238.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
121.58.236.0	PTR	0.236.58.121.-rev.convergeict.com
121.58.237.38	A	electronapp.com
121.58.237.42	A+PTR	mail.fastrak.com.ph
121.58.237.78	A	mail.nkti.gov.ph
121.58.237.211	PTR	211.237.58.121.-rev.convergeict.com
121.58.237.211	A	cybersoft.ph
121.58.237.211	A	mapcentral.ph
121.58.237.214	PTR	rdns214.convergeict.com
121.58.237.214	A	mail.cybersoft.ph
121.58.237.214	A	mail.mapcentral.ph
121.58.237.243	A	spug.ph
121.58.238.18	A	culturalcenter.gov.ph
121.58.238.30	PTR	30.238.58.121.-rev.convergeict.com
121.58.238.30	A	mx.culturalcenter.gov.ph
121.58.238.70	A	kidlat.arcuscloud.net
121.58.238.75	A	ns04.inc1914.net
121.58.238.75	A	mail04.inc1914.net
121.58.238.102	A+PTR	smart.arcusmail.net
121.58.238.102	A	arcusmail.net
121.58.238.123	A	arcusit.ph
121.58.238.150	A	dns3.bir.gov.ph
121.58.238.151	A	mailsvr.bir.gov.ph
121.58.238.153	A	birapps.bir.gov.ph
121.58.238.154	A	my.bir.gov.ph
121.58.238.155	A+PTR	cctr.bir.gov.ph
121.58.238.160	PTR	mx5.bir.gov.ph
121.58.238.160	A+PTR	www.bir.gov.ph
121.58.238.184	PTR	184.238.58.121.-rev.convergeict.com
121.58.238.184	A	edst.bir.gov.ph
121.58.238.197	A+PTR	mx2.bir.gov.ph
121.58.238.201	A+PTR	mx2.bir.gov.ph
121.58.238.206	A+PTR	mx2.bir.gov.ph
121.58.238.215	A	crs.bir.gov.ph
121.58.238.217	A	eorb.bir.gov.ph
121.58.238.219	A	trcms.bir.gov.ph
121.58.238.221	A	eaccreg.bir.gov.ph
121.58.238.222	A	esales.bir.gov.ph
121.58.239.255	PTR	255.239.58.121-rev.convergeict.com