Robtex

Up: 61.31.232.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 61.31.233.0/25
Down right: 61.31.233.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
61.31.233.1	A+PTR	dns.tfn.net.tw
61.31.233.1	A	dnsv1.tfn.net.tw
61.31.233.2	A	dnsx12.tfn.net.tw
61.31.233.3	A	dnsx13.tfn.net.tw
61.31.233.4	A+PTR	dnsx14.tfn.net.tw
61.31.233.5	A+PTR	dnsx15.tfn.net.tw
61.31.233.6	PTR	dns6.tfn.net.tw
61.31.233.6	A	dnsx16.tfn.net.tw
61.31.233.7	A+PTR	dnsx17.tfn.net.tw
61.31.233.8	A+PTR	dnsx18.tfn.net.tw
61.31.233.9	A+PTR	pdns.tfn.net.tw
61.31.233.67	A+PTR	61-31-233-67.static.tfn.net.tw
61.31.233.67	A	twmbroadband.com
61.31.233.67	A	twmfamily.com
61.31.233.69	PTR	smtp.dsd.tfn.net.tw
61.31.233.77	A	smtp01.tfn.net.tw
61.31.233.78	A	smtp02.tfn.net.tw
61.31.233.81	PTR	spamdna.tfn.net.tw
61.31.233.82	PTR	spamdna01.tfn.net.tw
61.31.233.83	PTR	spamdna02.tfn.net.tw
61.31.233.84	PTR	spamhole01.tfn.net.tw
61.31.233.91	A+PTR	email.anet.net.tw
61.31.233.92	A+PTR	smtp.anet.net.tw
61.31.233.93	PTR	mx.anet.net.tw
61.31.233.94	PTR	mail.pagic.net
61.31.233.95	A	crystalw01.anet.net.tw
61.31.233.96	A	crystalw02.anet.net.tw
61.31.233.97	A	crystalw03.anet.net.tw
61.31.233.98	A	crystalw04.anet.net.tw
61.31.233.99	A	crystalw05.anet.net.tw
61.31.233.100	A	crystali01.anet.net.tw
61.31.233.101	A	crystali02.anet.net.tw
61.31.233.104	A	crystalw06.anet.net.tw
61.31.233.105	A	crystalw07.anet.net.tw
61.31.233.110	A	email.tfn.net.tw
61.31.233.121	A+PTR	crystalt01.anet.net.tw
61.31.233.122	A	crystalt02.anet.net.tw
61.31.233.123	A	crystalt03.anet.net.tw