Robtex

Up: 139.223.22.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 139.223.22.0/25
Down right: 139.223.22.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
139.223.22.2	A+PTR	mail.tatung.com
139.223.22.2	A	tatung.com.tw
139.223.22.2	A	mail.tatung.com.tw
139.223.22.3	A+PTR	smtp.tatung.com
139.223.22.4	A	mail2.tatung.com.tw
139.223.22.6	A+PTR	smtp2.tatung.com
139.223.22.7	A+PTR	recmail.tatung.com
139.223.22.8	A+PTR	serversmtp.tatung.com
139.223.22.11	A+PTR	nopam1.tatung.com
139.223.22.12	A+PTR	nopam.tatung.com
139.223.22.119	A+PTR	119-relay.tatung.com