~$ whois 123.228.208.104
% [whois.apnic.net]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

% Information related to '123.228.0.0 - 123.229.255.255'

% Abuse contact for '123.228.0.0 - 123.229.255.255' is 'irt@nic.or.kr'

inetnum:        123.228.0.0 - 123.229.255.255
netname:        SK-TELECOM-NET
descr:          SK Telecom
admin-c:        IM687-AP
tech-c:         IM687-AP
country:        KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
last-modified:  2017-02-02T06:03:36Z
source:         APNIC

irt:            IRT-KRNIC-KR
address:        Jeollanam-do Naju-si Jinheung-gil
e-mail:         irt@nic.or.kr
abuse-mailbox:  irt@nic.or.kr
admin-c:        IM574-AP
tech-c:         IM574-AP
auth:           # Filtered
remarks:        irt@nic.or.kr was validated on 2019-10-01
mnt-by:         MNT-KRNIC-AP
last-modified:  2019-10-01T08:41:39Z
source:         APNIC

person:         IP Manager
address:        Seoul Jung-gu Eulji-ro 65
country:        KR
phone:          +82-2-1599-0011
e-mail:         sktsec@sk.com
nic-hdl:        IM687-AP
mnt-by:         MNT-KRNIC-AP
last-modified:  2017-10-10T00:50:38Z
source:         APNIC

% Information related to '123.228.0.0 - 123.229.255.255'

inetnum:        123.228.0.0 - 123.229.255.255
netname:        SK-TELECOM-NET-KR
descr:          SK Telecom
country:        KR
admin-c:        IA110-KR
tech-c:         IA110-KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
remarks:        This information has been partially mirrored by APNIC from
remarks:        KRNIC. To obtain more specific information, please use the
remarks:        KRNIC whois server at whois.kisa.or.kr.
changed:        hostmaster@nic.or.kr
source:         KRNIC

person:         IP Manager
address:        Seoul Jung-gu Eulji-ro 65
address:        T tower
country:        KR
phone:          +82-2-1599-0011
e-mail:         sktsec@sk.com
nic-hdl:        IA110-KR
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr
source:         KRNIC

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