Data as of Nov 9, 2026
204.251.255.0/24
No anonymizer space · no proxy exits in 30 daysSouthwest Texas Communications · space held by Cogent Communications, LLC
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 204.248.0.0/14 since May 2024 | AS174 | Internet provider | 51 13 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 |
|---|---|---|---|---|---|---|
| 204.248.0.0/14 | 262,144 | COGENT-204-248-0 | Cogent Communications, LLC (COGC) · US | Direct Allocation | Feb 1, 1995 | abuse@ |
| └ 204.251.252.0/22 | 1,024 | SPRINT-CCFBFF | Sidlinger Computer Corporation (SCC) · US | Reallocated | Apr 24, 1995 | sidlinger@ |
| └ 204.251.252.0/22 | 1,024 | SIDLINGER-SWTEXAS-252-255 | Southwest Texas Telephone Company (C02201320) · US | Reassigned | Apr 7, 2009 | sidlinger@ via SPRINT-CCFBFF |
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.
248. 0. 0/ 14 - Registration type
- Direct Allocation
- Record created
- Feb 1, 1995
- Legacy
- yes
- Reallocated to
- Sidlinger Computer Corporation (SCC)
- Reallocated range
- 204.
251. 252. 0/ 22 - Reallocated
- Apr 24, 1995
Origin network
AS46853
US
- Name
- Southwest Texas Communications
- Type
- Internet provider
- Registered
- Apr 3, 2009
- Domain
- swtexas.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 2006
- Current origin since
- Oct 2009 · 17 yr
- Origin networks
- 2
- Last change of origin
- Oct 2009
Recorded history
History
- Handoffs
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 204.251.255.0/24 | AS46853 | /24 | ARIN | RPKI valid |
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS46853 | ARIN | Route Registered for Cogent Communications Customer - Southwest Texas Telephone Company | MNT-COGC | Nov 4, 2026 |
Whois
Registration for this announcement
- Range
- 204.
251. 252. 0/ 22 - Netname
- SIDLINGER-SWTEXAS-252-255
- Registrant
- Southwest Texas Telephone Company
- Organization
- Southwest Texas Telephone Company (C02201320)
- Type
- Reassigned
- Handle
- NET-204-251-252-0-2
- Parent
- NET-204-251-252-0-1
- Created
- Apr 7, 2009
- RIR
- ARIN
- Country
- US
- Delegated
- Feb 1, 1995
- Status
- assigned
Report abuse
Abuse contact
- sidlinger@
gmail. com - Name
- Sidlinger, Bruce
- Phone
- +1-210-344-4825
- Handle
- BS2119-ARIN