Data as of Nov 8, 2026
50.169.225.0/24
No anonymizer space · no proxy exits in 30 daysSouthwest Research Institute · space held by Comcast Cable Communications, LLC
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 50.128.0.0/9 since Mar 2011 | AS7922 | Residential | 11,529 1,133 always on | Comcast Cable 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 |
|---|---|---|---|---|---|---|
| 50.128.0.0/9 | 8,388,608 | CCCH3-4 | Comcast Cable Communications, LLC (CCCS) · US | Direct Allocation | Oct 21, 2010 | abuse@ |
| └ 50.169.128.0/17 | 32,768 | DENVER-CCS-1 | Comcast Cable Communications, LLC (CCCS) · US | Reallocated | May 31, 2022 | abuse@ |
| └ 50.169.225.0/24 | 256 | SOUTHWEST-RESEARCH-INSTITUTE | Southwest Research Institute (C10827955) · US | Reassigned | Apr 29, 2024 | abuse@ via DENVER-CCS-1 |
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
- Comcast Cable Communications, LLC
- Handle
- CCCS
- Range
- 50.
128. 0. 0/ 9 - Registration type
- Direct Allocation
- Record created
- Oct 21, 2010
Origin network
AS397126
US
- Name
- Southwest Research Institute
- Type
- Education
- Registered
- Aug 31, 2022
- Domain
- swri.org
- Industry
- Software Development
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Apr 2024
- Current origin since
- Apr 2024 · 2.6 yr
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 50.169.225.0/24 | AS397126 | /24 | ARIN | RPKI valid |
| 50.128.0.0/9 | AS7922 | /9 | ARIN | Another network |
Whois
Registration for this announcement
- Range
- 50.
169. 225. 0/ 24 - Netname
- SOUTHWEST-RESEARCH-INSTITUTE
- Registrant
- Southwest Research Institute
- Organization
- Southwest Research Institute (C10827955)
- Type
- Reassigned
- Handle
- NET-50-169-225-0-1
- Parent
- NET-50-169-128-0-1
- Created
- Apr 29, 2024
- RIR
- ARIN
- Country
- US
- Delegated
- Oct 21, 2010
- Status
- assigned
Report abuse
Abuse contact
- abuse@
comcast. net - Name
- Network Abuse and Policy Observance
- Phone
- +1-888-565-4329
- Handle
- NAPO-ARIN