Data as of Nov 8, 2026
38.51.239.0/24
No anonymizer space · no proxy exits in 30 daysCogent Communications, LLC
Announcement
this exact prefix
RPKI invalid (origin)
Announced by
Type
Unknown
Risk
30 / 100 · Medium
Recently moved
Recent change
New origin Oct 10, 2026
from AS271907 Colnetwork C.A.
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Leased from | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|---|
| 38.0.0.0/8 | AS174 | Internet provider | IP broker Rackdog (part) | 403,985 78,265 always on | Cogent Communications, LLC |
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 |
|---|---|---|---|---|---|---|
| 38.0.0.0/8 | 16,777,216 | COGENT-A | Cogent Communications, LLC (COGC) · US | Direct Allocation | Apr 16, 1991 | abuse@ |
| └ 38.51.236.0/22 | 1,024 | COLNETWORK-CGNT-NET-1 | Colnetwork C.A. (C08773767) · VE | Reassigned | Jul 26, 2022 | abuse@ via COGENT-A |
A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.
Network & registry
IPv4 market
Holder
- Organization
- Cogent Communications, LLC
- Handle
- COGC
- Range
- 38.
0. 0. 0/ 8 - Registration type
- Direct Allocation
- Record created
- Apr 16, 1991
- Legacy
- yes
Origin network
AS174
US
- Name
- Cogent Communications, LLC
- Type
- Internet provider
- Registered
- May 16, 1996
- Domain
- cogentco.com
- Website
- www.cogentco.com/
- Industry
- Internet Service Provider (ISP)
- Spamhaus ASN-DROP
- not listed
- VPN servers
- 1,658
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Rotating
- First seen
- Aug 2023
- Current origin since
- Oct 10, 2026 · under a month
- Origin networks
- 2
- Last change of origin
- Oct 10, 2026
Recorded history
History
- Handoffs
- 1
- Also announced by
- 271907
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 38.51.236.0/22 | AS271907 | /24 | ARIN | Another network |
Whois
Registration for this announcement
- Range
- 38.
51. 236. 0/ 22 - Netname
- COLNETWORK-CGNT-NET-1
- Registrant
- Colnetwork C.A.
- Organization
- Colnetwork C.A. (C08773767)
- Type
- Reassigned
- Handle
- NET-38-51-236-0-1
- Parent
- NET-38-0-0-0-1
- Created
- Jul 26, 2022
- RIR
- ARIN
- Country
- US
- Delegated
- Apr 16, 1991
- Status
- assigned
Report abuse
Abuse contact
- abuse@
cogentco. com - Name
- Cogent Abuse
- Phone
- +1-877-875-4311
- Handle
- COGEN-ARIN