Robtex

Up: 131.253.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 131.253.128.0/18
Down right: 131.253.192.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
131.253.129.144	A+PTR	webpoolbn11a07.infra.lync.com
131.253.160.11	PTR	sippoolmaain102.infra.lync.com
131.253.160.12	A+PTR	webpoolmaain102.infra.lync.com
131.253.160.20	A	sipfedin1.online.lync.com
131.253.160.76	A	webpoolpnqin102.infra.lync.com
131.253.160.87	A	webdirin1.online.lync.com
131.253.161.139	A	sip.dbrs.com
131.253.161.139	A	sip.capitecbank.co.za
131.253.161.139	A	sip.xtel.net
131.253.161.145	PTR	sippoolblu2a03.infra.lync.com
131.253.161.203	A	sip.xtel.net
131.253.162.75	A	sip.fata-assicurazioni.it
131.253.162.75	A	sip.perfectomobile.com
131.253.162.75	A	www.gau.co.uk
131.253.162.139	A	sip.sprt.com
131.253.162.142	A	lyncdiscover.pim.ac.th
131.253.163.75	A	sip.gabler.no
131.253.163.75	A	sip.cofely.at
131.253.163.75	A	sip.affiniagroup.com
131.253.164.11	A	emc-france.net
131.253.164.11	A	sip.pim.ac.th
131.253.164.18	A	webpoolam41e02.infra.lync.com
131.253.164.19	A	sippoolam41e03.infra.lync.com
131.253.166.80	A	admindb41m.infra.lync.com
131.253.166.82	A	webpooldb41m01.infra.lync.com
131.253.166.83	A	sippooldb41m02.infra.lync.com
131.253.166.84	A	webpooldb41m02.infra.lync.com
131.253.166.139	A	sip.ccnetworks.dk
131.253.166.142	A	lyncdiscover.aircanada.ca
131.253.166.144	A	adminyqbca1.infra.lync.com
131.253.166.146	A	webpoolyqbca101.infra.lync.com
131.253.166.206	A	lyncdiscover.aircanada.ca
131.253.208.47	A+PTR	ch1we2se02.009d.dedicated.lync.com
131.253.233.14	A	portal.023d.dedicated.lync.com
131.253.233.90	A+PTR	ae1.019d.dedicated.lync.com
131.253.233.90	A	sip.gsk.com
131.253.233.94	A+PTR	rp1.019d.dedicated.lync.com
131.253.233.200	A	sipfed.volvocars.com
131.253.234.29	A+PTR	am3rp2.011d.dedicated.lync.com
131.253.234.105	A+PTR	am3ae3.027d.dedicated.lync.com