% 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 '2401:1900::/31'

% Abuse contact for '2401:1900::/31' is 'PSCoreNetwork@banglalink.net'

inet6num:       2401:1900::/31
netname:        BANGLALINK-BD
descr:          Banglalink Digital Communications Ltd
country:        BD
org:            ORG-BG1-AP
admin-c:        PCN2-AP
tech-c:         PCN2-AP
abuse-c:        AB961-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-BANGLALINK-BD
mnt-routes:     MAINT-BANGLALINK-BD
mnt-irt:        IRT-BANGLALINK-BD
last-modified:  2024-06-03T06:31:35Z
source:         APNIC

irt:            IRT-BANGLALINK-BD
address:        Tigers'Den , Plot
e-mail:         PSCoreNetwork@banglalink.net
abuse-mailbox:  PSCoreNetwork@banglalink.net
admin-c:        PCN2-AP
tech-c:         PCN2-AP
auth:           # Filtered
remarks:        psplanning@banglalink.net is valid
remarks:        pscorenetwork@banglalink.net was validated on 2025-07-17
mnt-by:         MAINT-BANGLALINK-BD
last-modified:  2025-11-18T00:26:37Z
source:         APNIC

organisation:   ORG-BG1-AP
org-name:       Banglalink Digital Communications Ltd
org-type:       LIR
country:        BD
address:        Tigers' Den, Plot # 4 SW (H), Gulshan Avenue
address:        Gulshan, Dhaka -1212
phone:          +8802-8827265
fax-no:         +8802-8827265
e-mail:         PSCoreNetwork@banglalink.net
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2024-07-11T12:55:54Z
source:         APNIC

role:           ABUSE BANGLALINKBD
country:        ZZ
address:        Tigers'Den , Plot # 4 SW(H), Gulshan Avenue,
phone:          +000000000
e-mail:         PSCoreNetwork@banglalink.net
admin-c:        PCN2-AP
tech-c:         PCN2-AP
nic-hdl:        AB961-AP
remarks:        Generated from irt object IRT-BANGLALINK-BD
remarks:        pscorenetwork@banglalink.net was validated on 2025-07-17
abuse-mailbox:  PSCoreNetwork@banglalink.net
mnt-by:         APNIC-ABUSE
last-modified:  2025-07-17T05:33:07Z
source:         APNIC

person:         PS Core Network
address:        Tigers' Den, House#4(SW), Bir Uttam Mir Shawkat Sharak, Gulshan-1, DHaka-1212, Bangladesh
country:        BD
phone:          +88028827265
e-mail:         PSCoreNetwork@banglalink.net
nic-hdl:        PCN2-AP
mnt-by:         MAINT-BANGLALINK-BD
last-modified:  2023-03-08T14:12:39Z
source:         APNIC

% Information related to '2401:1900:80ec::/46AS45245'

route6:         2401:1900:80ec::/46
origin:         AS45245
descr:          Banglalink Digital Communications Ltd
                Tigers' Den, Plot#4 SW (H), Gulshan Avenue
                Gulshan, Dhaka -1212
mnt-by:         MAINT-BANGLALINK-BD
last-modified:  2024-05-02T12:19:56Z
source:         APNIC

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