Data as of Nov 8, 2026
154.21.208.0/23
No anonymizer space · no proxy exits in 30 daysCity of Marshall · space held by Cogent Communications, LLC
Announcement
this exact prefix
RPKI valid
Announced by
Type
Business
Risk
0 / 100 · Low
Recent change
New origin Sep 2026
its first announcement on record
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 154.21.0.0/16 since Sep 2018 | AS174 | Internet provider | 291 45 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 |
|---|---|---|---|---|---|---|
| 154.21.0.0/16 | 65,536 | COGENT-154-21-16 | Cogent Communications, LLC (COGC) · US | Direct Allocation | Feb 5, 1992 | abuse@ |
| └ 154.21.208.0/23 | 512 | MARSHALL-FIBERNET-CGNT-NET-2 | City of Marshall (CM-1544) · US | Reassigned | Sep 17, 2026 | — |
Network & registry
IPv4 market
Holder
- Organization
- Cogent Communications, LLC
- Handle
- COGC
- Range
- 154.
21. 0. 0/ 16 - Registration type
- Direct Allocation
- Record created
- Feb 5, 1992
- Legacy
- yes
Origin network
AS397797
US
- Name
- City of Marshall
- Type
- Business
- Registered
- Aug 2, 2019
- Domain
- cityofmarshall.com
- 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
- Sep 2026
- Current origin since
- Sep 2026 · 2 mo
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 154.21.208.0/23 | AS397797 | /24 | ARIN | RPKI valid |
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS397797 | ARIN | Route Registered for Cogent Communications Customer - City of Marshall/Marshall Fibernet | MNT-COGC | Sep 17, 2026 |
Whois
Registration for this announcement
- Range
- 154.
21. 208. 0/ 23 - Netname
- MARSHALL-FIBERNET-CGNT-NET-2
- Registrant
- City of Marshall
- Organization
- City of Marshall (CM-1544)
- Org address
- 323 W. MICHIGAN AVE., MARSHALL, MI, 49068
- Org country
- US
- Type
- Reassigned
- Handle
- NET-154-21-208-0-1
- Parent
- NET-154-21-0-0-1
- Created
- Sep 17, 2026
- 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