Data as of Nov 7, 2026
129.19.240.0/20
No anonymizer space · no proxy exits in 30 daysUniversity of Colorado at Boulder · space held by Colorado State University
Announcement
this exact prefix
RPKI valid
Announced by
Type
Business
Risk
0 / 100 · Low
Recent change
New origin Aug 2026
its first announcement on record
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 129.19.192.0/18 since Nov 2024 | AS104 | Business | Colorado State University via University of Colorado Boulder | ||
| 129.19.0.0/16 since Oct 2009 | AS14041 | Business | 60 4 always on | Colorado State University |
Registrations in this block
The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 129.19.0.0/16 | 65,536 | WESTNET | Colorado State University (CSU-2-Z) · US | Direct Allocation | Jul 8, 1987 | dns. |
| └ 129.19.192.0/18 | 16,384 | UCB-WESTNET | University of Colorado Boulder (UCB-2) · US | Reallocated | Jan 15, 2019 | abuse@ |
Network & registry
Registry
Holder
- Organization
- Colorado State University
- Handle
- CSU-2-Z
- Range
- 129.
19. 0. 0/ 16 - Registration type
- Direct Allocation
- Record created
- Jul 8, 1987
- Legacy
- yes
- Reallocated to
- University of Colorado Boulder (UCB-2)
- Reallocated range
- 129.
19. 192. 0/ 18 - Reallocated
- Jan 15, 2019
Origin network
AS104
US
- Name
- University of Colorado at Boulder
- Type
- Education
- Registered
- Apr 9, 1987
- Domain
- colorado.edu
- Industry
- Colleges, Universities, and Professional Schools
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Aug 2026
- Current origin since
- Aug 2026 · 3 mo
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 129.19.240.0/20 | AS104 | /20 | ARIN | RPKI valid |
| 129.19.192.0/18 | AS104 | /18 | ARIN | Too specific |
| 129.19.0.0/16 | AS14041 | /16 | ARIN | Another network |
Whois
Registration for this announcement
- Range
- 129.
19. 192. 0/ 18 - Netname
- UCB-WESTNET
- Registrant
- University of Colorado Boulder
- Organization
- University of Colorado Boulder (UCB-2)
- Org address
- Office of Information Technology, Boulder, CO, 80309-0455
- Org country
- US
- Type
- Reallocated
- Handle
- NET-129-19-192-0-1
- Parent
- NET-129-19-0-0-1
- Created
- Jan 15, 2019
- RIR
- ARIN
- Country
- US
- Delegated
- Jul 8, 1987
- Status
- assigned
Report abuse
Abuse contact
- abuse@
colorado. edu - Name
- Abuse
- Phone
- +1-303-735-4357
- Handle
- ABUSE306-ARIN