% APNIC found the following authoritative answer from: whois.apnic.net

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

% Information related to '122.155.50.0 - 122.155.54.255'

% Abuse contact for '122.155.50.0 - 122.155.54.255' is 'admin-thix@cat.net.th'

inetnum:        122.155.50.0 - 122.155.54.255
netname:        CAT-my
descr:          CAT Wireless 99 Chaeng Watthana Road Bangkok
country:        TH
admin-c:        SMB8-AP
tech-c:         SS3950-AP
tech-c:         JM2201-AP
tech-c:         AC1657-AP
abuse-c:        AC1657-AP
status:         ALLOCATED NON-PORTABLE
mnt-by:         MAINT-CAT-TH
mnt-irt:        IRT-CAT-TH
last-modified:  2021-10-06T13:50:06Z
source:         APNIC

irt:            IRT-CAT-TH
address:        National Telecom Public Company Limited (CAT)
address:        NT Tower Bangkok Bangkok 10500
address:        Thailand
e-mail:         admin-thix@cat.net.th
abuse-mailbox:  admin-thix@cat.net.th
admin-c:        TC476-AP
tech-c:         IC174-AP
auth:           # Filtered
remarks:        admin-thix@cat.net.th was validated on 2025-01-15
mnt-by:         MAINT-TH-THIX-CAT
last-modified:  2025-01-15T04:40:28Z
source:         APNIC

role:           ABUSE CATTH
country:        ZZ
address:        National Telecom Public Company Limited (CAT)
address:        NT Tower Bangkok Bangkok 10500
address:        Thailand
phone:          +000000000
e-mail:         admin-thix@cat.net.th
admin-c:        TC476-AP
tech-c:         IC174-AP
nic-hdl:        AC1657-AP
remarks:        Generated from irt object IRT-CAT-TH
remarks:        admin-thix@cat.net.th was validated on 2025-01-15
abuse-mailbox:  admin-thix@cat.net.th
mnt-by:         APNIC-ABUSE
last-modified:  2025-01-15T04:40:56Z
source:         APNIC

person:         Jakkrit  Mongkon
address:        CAT Wireless 99 Moo 3  Chaeng Watthana Road Bangkok
country:        TH
phone:          +66-2-1041161
e-mail:         Jakkrit.m@cattelecom.com
nic-hdl:        JM2201-AP
mnt-by:         MAINT-CAT-TH
last-modified:  2017-02-01T09:38:02Z
source:         APNIC

person:         Support my byCAT
address:        CAT Telecom Public Company Limited
address:        Wireless Operation and Maintenance Department,
address:        72 CAT Telecom Tower, 12th Floor
address:        Charoenkrung Rd, Bangrak Bangkok
country:        TH
phone:          +66-210-411256
e-mail:         support@cat3g.com
nic-hdl:        SMB8-AP
mnt-by:         MAINT-TH-THIX-CAT
last-modified:  2014-10-31T03:43:45Z
source:         APNIC

person:         Sorapong sotthiwanichwong
address:        CAT Wireless 99 Moo 3  Chaeng Watthana Road Bangkok
country:        TH
phone:          +66 881-818844
e-mail:         sorapong.s@cattelecom.com
nic-hdl:        SS3950-AP
mnt-by:         MAINT-TH-THIX-CAT
last-modified:  2020-05-25T06:53:59Z
source:         APNIC

% Information related to '122.155.52.0/24AS9931'

route:          122.155.52.0/24
origin:         AS9931
descr:          CAT Telecom Public Company Limited
                13th CAT TELECOM TOWER
                NEW ROAD SRIPHRAYA BANGRAK
                BANGKOK
                THAILAND
mnt-by:         MAINT-CAT-TH
last-modified:  2024-03-18T02:55:11Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.34 (WHOIS-AU4)