% 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 '203.30.140.0 - 203.30.140.255'

% Abuse contact for '203.30.140.0 - 203.30.140.255' is 'abuse@centra.com.au'

inetnum:        203.30.140.0 - 203.30.140.255
netname:        CENTRANETWORKS-AU
descr:          Centra Networks
country:        AU
org:            ORG-CN1-AP
admin-c:        CNNA2-AP
tech-c:         CNNA2-AP
abuse-c:        AC2056-AP
status:         ASSIGNED 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-routes:     MAINT-CENTRANETWORKS-AU
mnt-irt:        IRT-CENTRANETWORKS-AU
last-modified:  2024-04-17T03:41:25Z
source:         APNIC

irt:            IRT-CENTRANETWORKS-AU
address:        1/200 Barry Pde Fortitude Valley QLD 4006
e-mail:         noc@centra.com.au
abuse-mailbox:  abuse@centra.com.au
admin-c:        CNNA2-AP
tech-c:         CNNA2-AP
auth:           # Filtered
remarks:        noc@centra.com.au was validated on 2025-11-12
remarks:        abuse@centra.com.au was validated on 2025-12-24
mnt-by:         MAINT-CENTRANETWORKS-AU
last-modified:  2025-12-24T01:50:00Z
source:         APNIC

organisation:   ORG-CN1-AP
org-name:       Centra Networks
org-type:       LIR
country:        AU
address:        1/200 Barry Parade
phone:          +61-7-36202100
e-mail:         support@centra.com.au
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2023-09-05T02:15:51Z
source:         APNIC

role:           ABUSE CENTRANETWORKSAU
country:        ZZ
address:        1/200 Barry Pde Fortitude Valley QLD 4006
phone:          +000000000
e-mail:         noc@centra.com.au
admin-c:        CNNA2-AP
tech-c:         CNNA2-AP
nic-hdl:        AC2056-AP
remarks:        Generated from irt object IRT-CENTRANETWORKS-AU
remarks:        noc@centra.com.au was validated on 2025-11-12
remarks:        abuse@centra.com.au was validated on 2025-12-24
abuse-mailbox:  abuse@centra.com.au
mnt-by:         APNIC-ABUSE
last-modified:  2025-12-24T01:50:39Z
source:         APNIC

role:           CENTRA NETWORKS - Network Administrator
address:        1/200 Barry Pde, Fortitude Valley QLD 4006
country:        AU
phone:          +61 7 3620 2100
e-mail:         support@centra.com.au
admin-c:        CNNA2-AP
tech-c:         CNNA2-AP
nic-hdl:        CNNA2-AP
mnt-by:         MAINT-CENTRANETWORKS-AU
last-modified:  2019-01-07T00:56:10Z
source:         APNIC

% Information related to '203.30.140.0/24AS4647'

route:          203.30.140.0/24
origin:         AS4647
descr:          Centra Networks
                1/200 Barry Parade
mnt-by:         MAINT-CENTRANETWORKS-AU
last-modified:  2024-08-20T21:12:34Z
source:         APNIC

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