2001:550:2:9::280:100

NetRange:       2001:550:: - 2001:550:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF
CIDR:           2001:550::/32
NetName:        COGC-6NET-0001
NetHandle:      NET6-2001-550-1
Parent:         ARIN-001 (NET6-2001-400-0)
NetType:        Direct Allocation
OriginAS:       AS174
Organization:   Cogent Communications (COGC)
RegDate:        2002-12-17
Updated:        2012-03-02
Ref:            https://rdap.arin.net/registry/ip/2001:550::

OrgName:        Cogent Communications
OrgId:          COGC
Address:        2450 N Street NW
City:           Washington
StateProv:      DC
PostalCode:     20037
Country:        US
RegDate:        2000-05-30
Updated:        2023-10-11
Comment:        Geofeed https://geofeed.cogentco.com/geofeed.csv
Ref:            https://rdap.arin.net/registry/entity/COGC

ReferralServer:  rwhois://rwhois.cogentco.com:4321

OrgAbuseHandle: COGEN-ARIN
OrgAbuseName:   Cogent Abuse
OrgAbusePhone:  +1-877-875-4311 
OrgAbuseEmail:  abuse@cogentco.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/COGEN-ARIN

OrgNOCHandle: ZC108-ARIN
OrgNOCName:   Cogent Communications
OrgNOCPhone:  +1-877-875-4311 
OrgNOCEmail:  noc@cogentco.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/ZC108-ARIN

OrgTechHandle: IPALL-ARIN
OrgTechName:   IP Allocation
OrgTechPhone:  +1-877-875-4311 
OrgTechEmail:  ipalloc@cogentco.com
OrgTechRef:    https://rdap.arin.net/registry/entity/IPALL-ARIN

RTechHandle: ZC108-ARIN
RTechName:   Cogent Communications
RTechPhone:  +1-877-875-4311 
RTechEmail:  noc@cogentco.com
RTechRef:    https://rdap.arin.net/registry/entity/ZC108-ARIN

Found a referral to rwhois.cogentco.com:4321.