Data as of Nov 7, 2026
129.19.176.0/20
No anonymizer space · no proxy exits in 30 daysColorado Mountain College · space held by Colorado State University
Announcement
this exact prefix
RPKI valid
Announced by
Type
Business
Risk
0 / 100 · Low
Recent change
Reallocated Jul 30, 2026
to University Corporation for Atmospheric Research by Colorado State University
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 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. |
| └ 129.19.128.0/18 | 16,384 | FRGP-PARTICIPANT-ASSIGNMENTS-01 | University Corporation for Atmospheric Research (UCAR-1) · US | Reallocated | Jul 30, 2026 | abuse@ |
| └ 129.19.176.0/20 | 4,096 | WESTNET-CMC-01 | Colorado Mountain College (CMC-152) · US | Reassigned | Jul 30, 2026 | — |
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 Corporation for Atmospheric Research (UCAR-1)
- Reallocated range
- 129.
19. 128. 0/ 18 - Reallocated
- Jul 30, 2026
Origin network
AS393869
US
- Name
- Colorado Mountain College
- Type
- Education
- Registered
- Apr 1, 2015
- Domain
- coloradomtn.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
- May 2007
- Current origin since
- Apr 2015 · 12 yr
- Origin networks
- 3
- Last change of origin
- Apr 2015
Recorded history
History
- Handoffs
- 2
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 129.19.176.0/20 | AS393869 | /24 | ARIN | RPKI valid |
| 129.19.0.0/16 | AS14041 | /16 | ARIN | Another network |
Whois
Registration for this announcement
- Range
- 129.
19. 176. 0/ 20 - Netname
- WESTNET-CMC-01
- Registrant
- Colorado Mountain College
- Organization
- Colorado Mountain College (CMC-152)
- Org address
- 802 GRAND AVENUE, GLENWOOD SPGS, CO, 81601
- Org country
- US
- Type
- Reassigned
- Handle
- NET-129-19-176-0-1
- Parent
- NET-129-19-128-0-1
- Created
- Jul 30, 2026
- RIR
- ARIN
- Country
- US
- Delegated
- Jul 8, 1987
- Status
- assigned
Report abuse
Abuse contact
- abuse@
ucar. edu - Name
- Abuse
- Phone
- +1-307-996-4300
- Handle
- ABUSE18-ARIN