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

% [whois.apnic.net]
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% Information related to '202.51.191.0 - 202.51.191.255'

% Abuse contact for '202.51.191.0 - 202.51.191.255' is 'abuse@adnsl.com'

inetnum:        202.51.191.0 - 202.51.191.255
netname:        Enterprise-Customer
descr:          ADN Telecom Ltd.
country:        BD
admin-c:        MK604-AP
tech-c:         MK604-AP
abuse-c:        AA1683-AP
status:         ASSIGNED NON-PORTABLE
mnt-by:         MAINT-ADNTELECOMLTD-BD
mnt-irt:        IRT-ADNTELECOMLTD-BD
last-modified:  2021-01-13T13:09:35Z
source:         APNIC

irt:            IRT-ADNTELECOMLTD-BD
address:        Red Crescent Concord Tower (19th Floor), 17, Mohakhali Commercial Area, Dhaka 1212
e-mail:         abuse@adnsl.com
abuse-mailbox:  abuse@adnsl.com
admin-c:        MK604-AP
tech-c:         MK604-AP
auth:           # Filtered
remarks:        abuse@adnsl.com was validated on 2025-11-05
mnt-by:         MAINT-ADNTELECOMLTD-BD
last-modified:  2025-11-18T00:28:18Z
source:         APNIC

role:           ABUSE ADNTELECOMLTDBD
country:        ZZ
address:        Red Crescent Concord Tower (19th Floor), 17, Mohakhali Commercial Area, Dhaka 1212
phone:          +000000000
e-mail:         abuse@adnsl.com
admin-c:        MK604-AP
tech-c:         MK604-AP
nic-hdl:        AA1683-AP
remarks:        Generated from irt object IRT-ADNTELECOMLTD-BD
remarks:        abuse@adnsl.com was validated on 2025-11-05
abuse-mailbox:  abuse@adnsl.com
mnt-by:         APNIC-ABUSE
last-modified:  2025-11-05T04:25:43Z
source:         APNIC

person:         Myen Uddin Kamol
nic-hdl:        MK604-AP
e-mail:         muddin@adnsl.net
address:        ADN Telecom Ltd.
address:        Red Crescent Concord Tower (19th Floor)
                17, Mohakhali Commercial Area
address:        Dhaka-1213
address:        Bangladesh.
phone:          +8802 9841234-8
country:        BD
mnt-by:         MAINT-ADNTELECOMLTD-BD
last-modified:  2017-10-05T04:06:34Z
source:         APNIC

% Information related to '202.51.191.0/24AS38203'

route:          202.51.191.0/24
descr:          ADN Telecom Limited.
descr:          Nationwide Internet Service Provider
origin:         AS38203
mnt-lower:      MAINT-ADNTELECOMLTD-BD
mnt-routes:     MAINT-ADNTELECOMLTD-BD
mnt-by:         MAINT-ADNTELECOMLTD-BD
last-modified:  2016-05-19T06:20:53Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.36-SNAPSHOT (WHOIS-AU5)