Data as of Nov 8, 2026
154.51.15.0/24
No anonymizer space · no proxy exits in 30 daysNextremum s.r.o. · space held by Cogent Communications, LLC
Announcement
this exact prefix
RPKI valid
Announced by
Type
Unknown
Risk
30 / 100 · Medium
Recently moved
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | RPKI |
|---|---|---|---|---|
| 154.48.0.0/12 since May 2005 | AS174 | Internet provider | 12,885 2,424 always on |
Network & registry
Origin network
AS208962
CZ
- Name
- Nextremum s.r.o.
- Type
- Internet provider
- Registered
- Jun 1, 2022
- Domain
- nextremum.net
- Website
- nextremum.net/
- Industry
- Computer and Information Technology
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Rotating
- First seen
- Mar 2024
- Current origin since
- Mar 2024 · 2.7 yr
- Origin networks
- 2
- Last change of origin
- Sep 2026
Recorded history
History
- Handoffs
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 154.51.15.0/24 | AS208962 | /24 | ARIN | RPKI valid |
Whois
Registration for this announcement
- Range
- 154.
51. 0. 0/ 16 - Netname
- COGENT-154-51-16
- Registrant
- Cogent Communications, LLC
- Organization
- Cogent Communications, LLC (COGC)
- Org address
- 2450 N Street NW, Washington, DC, 20037
- Org country
- US
- Type
- Direct Allocation
- Handle
- NET-154-51-0-0-1
- Parent
- NET-154-0-0-0-0
- Created
- Feb 5, 1992
- RIR
- ARIN
- Country
- US
- Delegated
- Feb 5, 1992
- Status
- assigned
Report abuse
Abuse contact
- abuse@
cogentco. com - Name
- Cogent Abuse
- Phone
- +1-877-875-4311
- Handle
- COGEN-ARIN