% 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 '103.44.156.0 - 103.44.159.255'

% Abuse contact for '103.44.156.0 - 103.44.159.255' is 'ipadmin@fbnet.in'

inetnum:        103.44.156.0 - 103.44.159.255
netname:        FBNET
descr:          FUTURE NETSANCHAR LIMITED
admin-c:        SD1150-AP
tech-c:         SD1150-AP
country:        IN
mnt-by:         MAINT-IN-IRINN
mnt-lower:      MAINT-IN-IRINN
mnt-irt:        IRT-FBNET-IN
mnt-routes:     MAINT-IN-FBNET
mnt-routes:     MAINT-IN-IRINN
status:         ALLOCATED PORTABLE
last-modified:  2025-08-11T22:49:11Z
source:         APNIC

irt:            IRT-FBNET-IN
address:        174/3, B L SAHA ROAD KOLKATA,Kolkata,West Bengal-700053
e-mail:         ipadmin@fbnet.in
abuse-mailbox:  ipadmin@fbnet.in
admin-c:        SD1150-AP
tech-c:         SD1150-AP
auth:           # Filtered
mnt-by:         MAINT-IN-FBNET
mnt-by:         MAINT-IN-IRINN
last-modified:  2026-07-27T09:44:36Z
source:         APNIC

person:         SOMA DAS
address:        174/3, B L SAHA ROAD KOLKATA,Kolkata,West Bengal-700053
country:        IN
phone:          +91 9330960282
e-mail:         ipadmin@fbnet.in
nic-hdl:        SD1150-AP
mnt-by:         MAINT-IN-FBNET
mnt-by:         MAINT-IN-IRINN
last-modified:  2025-09-27T09:54:26Z
source:         APNIC

% Information related to '103.44.158.0/24AS151712'

route:          103.44.158.0/24
descr:          Route & ROA
country:        IN
origin:         AS151712
mnt-by:         MAINT-IN-FBNET
mnt-by:         MAINT-IN-IRINN
mnt-routes:     MAINT-IN-IRINN
last-modified:  2025-12-14T22:16:59Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.48 (WHOIS-AU5)