[ IP ]

128.138.136.235

#503,465Top IPs · 1M scope0 domains

Overview

Top IPs list rank

1M: #503,465(13 observation hits)

Hosted domains (90 days): 0
Hosted domains (all time): 0
First seen
Last seen: Sun Sep 06 2026 14:34:53 GM
PDNS hits (90 days): 13
Country: US
Snapshot: 1970-01-01

Network operated by University of Colorado (UNIVER-24) (COLORADO).

List rank history

30 daily snapshots in the Top IPs list (1M scope). Lower rank numbers indicate more accumulated passive-DNS observation evidence.

Whois — 128.138.136.235

Netname: COLORADO
Organization: University of Colorado (UNIVER-24)
Country: US
ASN: —

Full whois record


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


NetRange:       128.138.0.0 - 128.138.255.255
CIDR:           128.138.0.0/16
NetName:        COLORADO
NetHandle:      NET-128-138-0-0-1
Parent:         NET128 (NET-128-0-0-0-0)
NetType:        Direct Allocation
OriginAS:       
Organization:   University of Colorado (UNIVER-24)
RegDate:        1986-07-14
Updated:        2021-12-14
Ref:            https://rdap.arin.net/registry/ip/128.138.0.0


OrgName:        University of Colorado
OrgId:          UNIVER-24
Address:        Office of Information Technology
Address:        3645 Marine Street
City:           Boulder
StateProv:      CO
PostalCode:     80309-0455
Country:        US
RegDate:        1986-03-11
Updated:        2019-06-25
Ref:            https://rdap.arin.net/registry/entity/UNIVER-24


OrgTechHandle: CUBOU-ARIN
OrgTechName:   CUBoulder
OrgTechPhone:  +1-303-735-4357 
OrgTechEmail:  [email protected]
OrgTechRef:    https://rdap.arin.net/registry/entity/CUBOU-ARIN

OrgAbuseHandle: ABUSE306-ARIN
OrgAbuseName:   Abuse
OrgAbusePhone:  +1-303-735-4357 
OrgAbuseEmail:  [email protected]
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE306-ARIN

RAbuseHandle: ABUSE306-ARIN
RAbuseName:   Abuse
RAbusePhone:  +1-303-735-4357 
RAbuseEmail:  [email protected]
RAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE306-ARIN

RTechHandle: CUBOU-ARIN
RTechName:   CUBoulder
RTechPhone:  +1-303-735-4357 
RTechEmail:  [email protected]
RTechRef:    https://rdap.arin.net/registry/entity/CUBOU-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Hosted domains — PDNS pivot

Domain	Rank	First seen	Last seen	Hits
colorado.edu	#24,895	2026-07-14	2026-09-06	13