Data as of Nov 12, 2026
204.97.136.0/21
Anonymizer · ISP proxyWindstream Communications LLC · space held by Cogent Communications, LLC
Announcement
this exact prefix
No RPKI
Announced by
Type
ISP proxy
Risk
90 / 100 · Critical
Recent change
New origin Sep 28, 2026
its first announcement on record
IPv4 market
Path
Announced by AS7029 since Sep 28, 2026 · 6 wk ago
4 · Use
ISP proxy
anonymizer space, operator not named
Operators, sellers and brokers
Leased from
IP brokers
| Name | In 204.97.136.0/21 | /24s |
|---|---|---|
| Rackdog | 2,048100% | 8 |
Leased from
Owners leasing their own space
| Name | In 204.97.136.0/21 | /24s |
|---|---|---|
| Cogent Communications, LLC | 2,048100% | 8 |
Lineage
How this block came to its use, oldest first. The whole IPv4 market →
204.97.136.0/21
From the registry to its use
- Jul 13, 1994Registry recordCogent Communications, LLCDirect Allocation (legacy, pre-1997)204.94.0.0 - 204.97.255.255
- Aug 16, 2025– today
- May 27, 2026AssignedRCNReassigned204.97.128.0/18
- Sep 28, 2026– today
- Oct 2, 2026Route objectRackdogRADB route object for AS7029 Windstream Communications LLC, maintainer MAINT-AS398465
- todayLeased fromRackdogIP broker
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Leased from | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|---|
| 204.97.128.0/20 since Aug 2025 | AS6079 | ISP proxy | IP broker Rackdog | Cogent Communications, LLC | ||
| 204.97.128.0/18 since Jul 2026 | AS22773 | ISP proxy | IP broker Rackdog | 2 | Cogent Communications, LLC | |
| 204.96.0.0/15 since May 2024 | AS174 | Internet provider | 2 | 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 |
|---|---|---|---|---|---|---|
| 204. | 262,144 | COGC | Cogent Communications, LLC (COGC) · US | Direct Allocation | Jul 13, 1994 | abuse@ |
| └ 204.97.128.0/18 | 16,384 | RACKDOG-CGNT-NET-35 | RCN (C11605230) · US | Reassigned | May 27, 2026 | abuse@ via COGC |
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
- 204.
94. 0. 0 - 204. 97. 255. 255 - Registration type
- Direct Allocation
- Record created
- Jul 13, 1994
- Legacy
- yes
Origin network
AS7029
US
- Name
- Windstream Communications LLC
- Type
- Internet provider
- Registered
- Jul 30, 1996
- Domain
- uniti.com
- Website
- www.uniti.com/
- Industry
- Internet Service Provider (ISP)
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Sep 28, 2026
- Current origin since
- Sep 28, 2026 · 1 mo
- Origin networks
- 1
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS7029 | RADB | MAINT-AS398465 | Oct 2, 2026 |
Whois
Registration for this announcement
- Range
- 204.
97. 128. 0/ 18 - Netname
- RACKDOG-CGNT-NET-35
- Registrant
- RCN
- Organization
- RCN (C11605230)
- Type
- Reassigned
- Handle
- NET-204-97-128-0-1
- Parent
- NET-204-94-0-0-1
- Created
- May 27, 2026
- RIR
- ARIN
- Country
- US
- Delegated
- Jul 13, 1994
- Status
- assigned
Report abuse
Abuse contact
- abuse@
cogentco. com - Name
- Cogent Abuse
- Phone
- +1-877-875-4311
- Handle
- COGEN-ARIN