% APNIC found the following authoritative answer from: whois.ripe.net

% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See https://apps.db.ripe.net/docs/HTML-Terms-And-Conditions

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to '192.135.15.0 - 192.135.15.255'

% Abuse contact for '192.135.15.0 - 192.135.15.255' is 'cert@garr.it'

inetnum:        192.135.15.0 - 192.135.15.255
netname:        INFNET39
descr:          INFN - CCSEM - Erice
country:        IT
org:            ORG-INDF53-RIPE
admin-c:        AZ8967-RIPE
tech-c:         PA4923-RIPE
status:         LEGACY
remarks:        This prefix is statically assigned
remarks:        To notify abuse mailto: cert@garr.it
remarks:        GARR - Italian academic and research network
mnt-by:         GARR-LIR
mnt-irt:        IRT-GARR-CERT
created:        1970-01-01T00:00:00Z
last-modified:  2024-05-10T10:34:18Z
source:         RIPE

organisation:   ORG-INDF53-RIPE
org-name:       Istituto Nazionale di Fisica Nucleare INFN
country:        IT
org-type:       OTHER
address:        Via Enrico Fermi, 40
address:        00044
address:        Frascati (RM)
address:        I
abuse-c:        AG16225-RIPE
mnt-ref:        GARR-LIR
mnt-by:         GARR-LIR
created:        2014-04-09T12:47:26Z
last-modified:  2022-12-01T17:15:15Z
source:         RIPE # Filtered

person:         Antonino Zichichi
address:        INFN - CCSEM - Erice
address:        Via Guarnotta, 26
address:        I-91016-Erice
address:        Italy
phone:          +39
nic-hdl:        AZ8967-RIPE
mnt-by:         GARR-LIR
created:        2024-05-10T10:33:57Z
last-modified:  2024-05-10T10:33:57Z
source:         RIPE

person:         Pino Aceto
address:        Centro Ettore Majorana
address:        Via Guarnotta, 26
address:        I-91016 Erice (TP)
address:        Italy
phone:          +39 0923 869133
fax-no:         +39 0923 869226
nic-hdl:        PA4923-RIPE
mnt-by:         GARR-LIR
created:        2009-05-20T10:51:22Z
last-modified:  2020-03-19T10:50:45Z
source:         RIPE # Filtered

% Information related to '192.135.8.0/21AS137'

route:          192.135.8.0/21
descr:          Aggregated GARR routes
origin:         AS137
remarks:        INFN aggregated block
remarks:        To notify abuse mailto: cert@garr.it
mnt-by:         GARR-LIR
created:        2002-04-24T11:36:53Z
last-modified:  2024-02-23T15:37:09Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.112 (SHETLAND)

Search for
IP address lookups			Miscellaneous queries
-l	1st level less specific		-i	Inverse attributes	None admin-c admin-c,tech-c,zone-c author cross-mnt cross-nfy local-as mbrs-by-ref member-of mnt-by mnt-lower mnt-nfy mnt-routes notify nserver origin person referral-by rev-srv sub-dom tech-c upd-to zone-c
-L	All less specific		-T	Object types	All as-block as-set aut-num domain filter-set inet-rtr inet6num inetnum irt key-cert mntner peering-set person role route route-set rtr-set
-m	1st level more specific
-M	All more specific		Query hints Include "AS" in front of an AS number. Example: AS4808 Include "-t" (template only) or "-v" (template and description) in front of an object name to view the template Example: -t inetnum
-x	Exact match only
-d	Associated reverse domain