Data as of Nov 7, 2026
138.23.104.0/22
No anonymizer space · no proxy exits in 30 daysUniversity of California, Riverside
Announcement
this exact prefix
No RPKI
Announced by
Type
Business
Risk
0 / 100 · Low
Recent change
New origin Sep 18, 2026
from AS6106 University of California, Riverside, after 7.3 years unannounced
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 138.23.0.0/16 since May 2005 | AS6106 | Business | University of California, Riverside |
Network & registry
Origin network
AS6106
US
- Name
- University of California, Riverside
- Type
- Business
- Registered
- Nov 10, 1995
- Domain
- ucr.edu
- Industry
- Government and Regulatory Agencies, Administrations, Departments, and Services
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Jul 2015
- Current origin since
- Sep 18, 2026 · 2 mo
- Origin networks
- 1
Whois
Registration for this announcement
- Range
- 138.
23. 0. 0/ 16 - Netname
- UCRNET
- Registrant
- University of California, Riverside
- Organization
- University of California, Riverside (UNIVER-211-Z)
- Org address
- University of California, Riverside, Riverside, CA, 92521
- Org country
- US
- Type
- Direct Allocation
- Handle
- NET-138-23-0-0-1
- Parent
- NET-138-0-0-0-0
- Created
- Jan 24, 1990
- RIR
- ARIN
- Country
- US
- Delegated
- Jan 24, 1990
- Status
- assigned
Report abuse
Abuse contact
- abuse@
ucr. edu - Name
- Abuse
- Phone
- +1-951-827-4875
- Handle
- ABUSE1631-ARIN