% 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 '103.145.74.0 - 103.145.74.255'

% Abuse contact for '103.145.74.0 - 103.145.74.255' is 'masternet028@gmail.com'

inetnum:        103.145.74.0 - 103.145.74.255
netname:        MASTERNET-BD
descr:          Master Net
country:        BD
geoloc:         23.8617017 90.2564926
org:            ORG-MN13-AP
admin-c:        MNA32-AP
tech-c:         MNA32-AP
abuse-c:        AM2383-AP
status:         ALLOCATED PORTABLE
remarks:        --------------------------------------------------------
remarks:        To report network abuse, please contact mnt-irt
remarks:        For troubleshooting, please contact tech-c and admin-c
remarks:        Report invalid contact via www.apnic.net/invalidcontact
remarks:        --------------------------------------------------------
mnt-by:         APNIC-HM
mnt-lower:      MAINT-MASTERNET-BD
mnt-routes:     MAINT-MASTERNET-BD
mnt-irt:        IRT-MASTERNET-BD
last-modified:  2025-06-06T04:01:43Z
source:         APNIC

irt:            IRT-MASTERNET-BD
address:        A-111/13,Vatpara,Savar,Dhaka-1343, Savar Dhaka 1343
e-mail:         masternet028@gmail.com
abuse-mailbox:  masternet028@gmail.com
admin-c:        MNA32-AP
tech-c:         MNA32-AP
auth:           # Filtered
remarks:        rubel@masternetbd.net is valid
remarks:        masternet028@gmail.com was validated on 2025-11-11
mnt-by:         MAINT-MASTERNET-BD
last-modified:  2025-11-18T00:33:23Z
source:         APNIC

organisation:   ORG-MN13-AP
org-name:       Master Net
org-type:       LIR
country:        BD
address:        A-111/13,Vatpara,Savar,Dhaka-1343
phone:          +8801980555525
e-mail:         support@masternetbd.net
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2025-05-25T13:08:19Z
source:         APNIC

role:           ABUSE MASTERNETBD
country:        ZZ
address:        A-111/13,Vatpara,Savar,Dhaka-1343, Savar Dhaka 1343
phone:          +000000000
e-mail:         masternet028@gmail.com
admin-c:        MNA32-AP
tech-c:         MNA32-AP
nic-hdl:        AM2383-AP
remarks:        Generated from irt object IRT-MASTERNET-BD
remarks:        masternet028@gmail.com was validated on 2025-11-11
abuse-mailbox:  masternet028@gmail.com
mnt-by:         APNIC-ABUSE
last-modified:  2025-11-11T19:28:58Z
source:         APNIC

role:           Master Net administrator
address:        A-128/3,Vatpara,Savar,Dhaka-1343, Savar Dhaka 1343
country:        BD
phone:          +8801980555525
e-mail:         support@masternetbd.net
admin-c:        MNA32-AP
tech-c:         MNA32-AP
nic-hdl:        MNA32-AP
mnt-by:         MAINT-MASTERNET-BD
last-modified:  2019-11-14T04:37:09Z
source:         APNIC

% Information related to '103.145.74.0/24AS139806'

route:          103.145.74.0/24
origin:         AS139806
descr:          Md Asaduzzaman Khan
                A-111/13,Vatpara,Savar,Dhaka-1343
mnt-by:         MAINT-MASTERNET-BD
last-modified:  2025-05-29T09:16:35Z
source:         APNIC

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