% 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 'AS139578 - AS140601'

as-block:       AS139578 - AS140601
descr:          APNIC ASN block
remarks:        These AS numbers are further assigned by APNIC
remarks:        to APNIC members and end-users in the APNIC region
admin-c:        HM20-AP
tech-c:         HM20-AP
mnt-by:         APNIC-HM
mnt-lower:      APNIC-HM
last-modified:  2019-06-13T01:03:23Z
source:         APNIC

role:           APNIC Hostmaster
address:        6 Cordelia Street
address:        South Brisbane
address:        QLD 4101
country:        AU
phone:          +61 7 3858 3100
fax-no:         +61 7 3858 3199
e-mail:         helpdesk@apnic.net
admin-c:        AMS11-AP
tech-c:         AH256-AP
nic-hdl:        HM20-AP
remarks:        Administrator for APNIC
notify:         hostmaster@apnic.net
mnt-by:         MAINT-APNIC-AP
last-modified:  2013-10-23T04:06:51Z
source:         APNIC

% Information related to 'AS140287'

% Abuse contact for 'AS140287' is 'admin@okay.net.bd'

aut-num:        AS140287
as-name:        OKNET-AS-AP
descr:          OK Network and Communications
country:        BD
org:            ORG-ONAC2-AP
admin-c:        ONAC1-AP
tech-c:         ONAC1-AP
abuse-c:        AO359-AP
mnt-lower:      MAINT-OKNET-BD
mnt-routes:     MAINT-OKNET-BD
mnt-by:         APNIC-HM
mnt-irt:        IRT-OKNET-BD
last-modified:  2020-10-15T09:11:40Z
source:         APNIC

irt:            IRT-OKNET-BD
address:        201 J,N,Saha road, Dhaka,Bangladesh
e-mail:         admin@okay.net.bd
abuse-mailbox:  admin@okay.net.bd
admin-c:        ONAC1-AP
tech-c:         ONAC1-AP
auth:           # Filtered
remarks:        admin@okay.net.bd is invalid
mnt-by:         MAINT-OKNET-BD
last-modified:  2024-01-24T13:09:04Z
source:         APNIC

organisation:   ORG-ONAC2-AP
org-name:       OK Network and Communications
org-type:       LIR
country:        BD
address:        201 J,N,Saha Road
phone:          +8801711715048
e-mail:         admin@okay.net.bd
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2023-09-05T02:18:09Z
source:         APNIC

role:           ABUSE OKNETBD
address:        201 J,N,Saha road, Dhaka,Bangladesh
country:        ZZ
phone:          +000000000
e-mail:         admin@okay.net.bd
admin-c:        ONAC1-AP
tech-c:         ONAC1-AP
nic-hdl:        AO359-AP
remarks:        Generated from irt object IRT-OKNET-BD
remarks:        admin@okay.net.bd is invalid
abuse-mailbox:  admin@okay.net.bd
mnt-by:         APNIC-ABUSE
last-modified:  2024-01-24T13:12:44Z
source:         APNIC

role:           OK Network and Communications administrator
address:        201 J,N,Saha Road, dhaka Lalbag 1211
country:        BD
phone:          +8801711715048
e-mail:         hrk@okay.net.bd
admin-c:        ONAC1-AP
tech-c:         ONAC1-AP
nic-hdl:        ONAC1-AP
mnt-by:         MAINT-OKNET-BD
last-modified:  2020-03-13T14:37:38Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.25 (WHOIS-AU1)

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