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

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% The objects are in RPSL format.
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% Information related to '192.87.100.0 - 192.87.100.255'

% Abuse contact for '192.87.100.0 - 192.87.100.255' is 'cert@surfcert.nl'

inetnum:        192.87.100.0 - 192.87.100.255
netname:        introweb-net
descr:          IntroWeb B.V.
country:        NL
admin-c:        SH2419-RIPE
tech-c:         PB2610-RIPE
status:         LEGACY
mnt-by:         SN-LIR-MNT
mnt-irt:        irt-CERT-NL
created:        2005-06-08T08:38:43Z
last-modified:  2019-12-04T13:23:51Z
source:         RIPE

person:         Peter Bult
address:        IntroWeb BV
address:        Welbergweg 30
address:        NL-7556 PE  Hengelo
address:        NETHERLANDS
phone:          +31 742430105
fax-no:         +31 742429895
nic-hdl:        PB2610-RIPE
mnt-by:         SN-LIR-MNT
remarks:        Do *not* send complaints about spam and other abuse
remarks:        directly to me, use abuse@introweb.nl
created:        2005-02-15T16:23:39Z
last-modified:  2005-02-15T16:23:39Z
source:         RIPE # Filtered

person:         Sandra Hassink
address:        IntroWeb BV
address:        Welbergweg 30
address:        NL-7556 PE  Hengelo
address:        NETHERLANDS
phone:          +31 742430105
fax-no:         +31 742429895
nic-hdl:        SH2419-RIPE
mnt-by:         SN-LIR-MNT
remarks:        Do *not* send complaints about spam and other abuse
remarks:        directly to me, use abuse@introweb.nl
created:        2005-02-15T16:23:38Z
last-modified:  2005-02-15T16:23:38Z
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 1.114 (BUSA)

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IP address lookups			Miscellaneous queries
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