143.233.204.0/24

NetRange:       143.233.0.0 - 143.234.255.255
CIDR:           143.233.0.0/16, 143.234.0.0/16
NetName:        RIPE-ERX-143-233-0-0
NetHandle:      NET-143-233-0-0-1
Parent:         NET143 (NET-143-0-0-0-0)
NetType:        Early Registrations, Transferred to RIPE NCC
OriginAS:       
Organization:   RIPE Network Coordination Centre (RIPE)
RegDate:        2003-11-12
Updated:        2003-11-12
Comment:        These addresses have been further assigned to users in
Comment:        the RIPE NCC region.  Contact information can be found in
Comment:        the RIPE database at http://www.ripe.net/whois
Ref:            https://rdap.arin.net/registry/ip/143.233.0.0

ResourceLink:  https://apps.db.ripe.net/search/query.html
ResourceLink:  whois.ripe.net

OrgName:        RIPE Network Coordination Centre
OrgId:          RIPE
Address:        P.O. Box 10096
City:           Amsterdam
StateProv:      
PostalCode:     1001EB
Country:        NL
RegDate:        
Updated:        2013-07-29
Ref:            https://rdap.arin.net/registry/entity/RIPE

ReferralServer:  whois://whois.ripe.net
ResourceLink:  https://apps.db.ripe.net/search/query.html

OrgAbuseHandle: ABUSE3850-ARIN
OrgAbuseName:   Abuse Contact
OrgAbusePhone:  +31205354444 
OrgAbuseEmail:  abuse@ripe.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE3850-ARIN

OrgTechHandle: RNO29-ARIN
OrgTechName:   RIPE NCC Operations
OrgTechPhone:  +31 20 535 4444 
OrgTechEmail:  hostmaster@ripe.net
OrgTechRef:    https://rdap.arin.net/registry/entity/RNO29-ARIN

Found a referral to whois.ripe.net.

inetnum:        143.233.204.0 - 143.233.204.255
netname:        AUA-NET
descr:          Agricultural University of Athens
country:        GR
admin-c:        AUoA1-RIPE
tech-c:         AUoA1-RIPE
status:         LEGACY
mnt-by:         AS2546-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2019-12-04T13:04:07Z
source:         RIPE

role:           Agricultural University of Athens-NOC
address:        Iera Odos 75
address:        Athens GR-11855
address:        Greece
phone:          +301-5294202
fax-no:         +301-5294199
admin-c:        TM482-RIPE
tech-c:         TM482-RIPE
remarks:        --------------------------------------
remarks:        For complains about abuse, spam etc:
abuse-mailbox:  abuse@aua.gr
remarks:        --------------------------------------
mnt-by:         GRNET-NOC
nic-hdl:        AUoA1-RIPE
created:        2009-01-27T10:56:59Z
last-modified:  2019-04-15T06:26:14Z
source:         RIPE # Filtered

route:          143.233.204.0/24
descr:          Agricultural University of Athens
origin:         AS5408
mnt-by:         AS2546-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2010-07-08T08:19:34Z
source:         RIPE