161.53.160.104

NetRange:       161.52.0.0 - 161.54.255.255
CIDR:           161.52.0.0/15, 161.54.0.0/16
NetName:        RIPE-ERX-161-52-0-0
NetHandle:      NET-161-52-0-0-1
Parent:         NET161 (NET-161-0-0-0-0)
NetType:        Early Registrations, Transferred to RIPE NCC
OriginAS:       
Organization:   RIPE Network Coordination Centre (RIPE)
RegDate:        2004-02-18
Updated:        2004-02-18
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/161.52.0.0

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:        161.53.159.0 - 161.53.160.255
netname:        CARNET-BACKBONE
descr:          Carnet backbone
country:        HR
admin-c:        CN1130-RIPE
tech-c:         CN1130-RIPE
status:         ASSIGNED PA
remarks:        INFRA-AW
mnt-by:         AS2108-MNT
created:        2009-03-12T14:46:00Z
last-modified:  2015-07-17T10:47:00Z
source:         RIPE

role:           CARNet NOC
address:        J.Marohnica 5
address:        10000 Zagreb
address:        Croatia
phone:          +385 1 6661 616
abuse-mailbox:  abuse@carnet.hr
admin-c:        IV762-RIPE
admin-c:        DK2798-RIPE
tech-c:         IV762-RIPE
tech-c:         DK2798-RIPE
nic-hdl:        CN1130-RIPE
mnt-by:         AS2108-MNT
created:        2005-11-21T13:40:28Z
last-modified:  2011-03-16T15:19:10Z
source:         RIPE # Filtered

route:          161.53.0.0/16
descr:          CARNET
origin:         AS2108
mnt-by:         AS2108-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2001-09-22T09:31:53Z
source:         RIPE