% 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://docs.db.ripe.net/terms-conditions.html

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

% Information related to '192.87.106.0 - 192.87.106.255'

% Abuse contact for '192.87.106.0 - 192.87.106.255' is 'cert@surfcert.nl'

inetnum:        192.87.106.0 - 192.87.106.255
netname:        SNET-AT-SARA
descr:          SURFnet IP LAN at SARA
descr:          Amsterdam
country:        NL
admin-c:        SNS1-RIPE
tech-c:         SNS1-RIPE
status:         LEGACY
mnt-by:         SN-LIR-MNT
mnt-by:         SURF-AUTO-MNT
mnt-irt:        irt-SURFcert
created:        2002-06-05T16:22:02Z
last-modified:  2025-10-01T16:45:52Z
source:         RIPE

role:           SURF Network Maintainer
address:        Kantoren Hoog Overborch (Hoog Catharijne)
address:        Moreelsepark 48, 3511 EP Utrecht
address:        Postbus 19035, 3501 DA Utrecht
phone:          +31 88 7873000
admin-c:        WB311-RIPE
tech-c:         NO17-RIPE
tech-c:         WB311-RIPE
tech-c:         MK512-RIPE
tech-c:         JO5863-RIPE
tech-c:         MM57501-RIPE
tech-c:         BW4086-RIPE
tech-c:         EV4604-RIPE
nic-hdl:        SNS1-RIPE
abuse-mailbox:  cert@surfcert.nl
mnt-by:         AS1103-MNT
created:        2002-07-09T10:06:06Z
last-modified:  2025-11-05T14:44:07Z
source:         RIPE # Filtered

% Information related to '192.87.0.0/16AS1103'

route:          192.87.0.0/16
descr:          SURFnet CIDR Block IV
origin:         AS1103
mnt-by:         AS1103-MNT
mnt-lower:      SN-LIR-MNT
created:        2001-12-13T14:32:00Z
last-modified:  2021-01-22T15:03:04Z
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.120 (ABERDEEN)