Robtex

Up: 193.32.32.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 193.32.34.0/24
Down right: 193.32.35.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
193.32.34.9	A+PTR	sppim502.aexp.com
193.32.34.9	PTR	welcome.aexp.com
193.32.34.23	A+PTR	home5.americanexpress.com
193.32.34.30	A+PTR	sppim501.aexp.com
193.32.34.30	PTR	welcome.aexp.com
193.32.34.37	A+PTR	br2.americanexpress.com
193.32.34.52	A+PTR	qbr2.americanexpress.com
193.32.34.66	A	gw.aexp.com
193.32.34.66	A	amexnetwork.ru
193.32.34.67	A+PTR	gw2.aexp.com
193.32.34.73	A+PTR	phxamgw01.aexp.com
193.32.34.73	PTR	welcome.aexp.com
193.32.34.74	A+PTR	phxamgw02.aexp.com
193.32.34.74	PTR	welcome.aexp.com
193.32.34.80	PTR	sppig005.aexp.com
193.32.34.81	A+PTR	sppig007.aexp.com
193.32.34.82	A+PTR	sppig008.aexp.com
193.32.34.83	A+PTR	gw7.aexp.com
193.32.34.83	PTR	sppig010.aexp.com
193.32.34.84	A+PTR	sppig006.aexp.com
193.32.34.85	A+PTR	gw6.aexp.com
193.32.34.85	PTR	sppig009.aexp.com
193.32.34.86	A+PTR	sppig001.aexp.com
193.32.34.87	A+PTR	sppig002.aexp.com
193.32.34.88	A+PTR	sppig003.aexp.com
193.32.34.89	PTR	sppig004.aexp.com
193.32.34.106	A	gtm2.aexp.com
193.32.34.107	PTR	american-express.ch
193.32.34.107	PTR	membershiprewards.de
193.32.34.107	PTR	american-express.fr
193.32.34.110	A	phxqipext1.aexp.com
193.32.34.111	A+PTR	phxextqip2.aexp.com
193.32.34.111	A	phxqipext2.aexp.com
193.32.34.135	A+PTR	www9.americanexpress.com
193.32.34.167	A+PTR	qmy.americanexpress.com
193.32.34.189	A	qhome4.americanexpress.com
193.32.34.190	A+PTR	home4.americanexpress.com
193.32.34.220	A	qfinance.americanexpress.com
193.32.34.223	A	br1.americanexpress.com
193.32.34.226	A+PTR	qlogin.americanexpress.com
193.32.34.231	A	login.americanexpress.com
193.32.35.19	A	ns2.servevirtual.net
193.32.35.22	A	playmoneymover.com
193.32.35.22	A	serve.com
193.32.35.22	A	www.serve.com
193.32.35.23	A	spentthemovie.com
193.32.35.38	A	amexserve.com
193.32.35.38	A	amex-serve.com
193.32.35.52	A+PTR	mailout2.serve.com
193.32.35.58	A	mailin2.serve.com
193.32.35.66	A+PTR	mailout2.es.serve.com
193.32.35.70	A	bluebird.com
193.32.35.71	A	offers.serve.com
193.32.35.97	A	secure.prepaidredcard.com
193.32.35.123	A	svcmob.servevirtual.net