Data as of Nov 4, 2026
147.72.252.0/22
No anonymizer space · no proxy exits in 30 daysSoftware Engineering Institute · space held by Pittsburgh Supercomputing Center
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 |
|---|---|---|---|---|---|---|
| 147.72.0.0/16 | 65,536 | PSC-PPP-SUBNET | Pittsburgh Supercomputing Center (PSC-Z) · US | Direct Allocation | Jul 5, 1991 | [email protected] |
| └ 147.72.252.0/22 | 1,024 | PSC-BLK72-252-22 | Software Engineering Institute (CERT-1) · US | Reassigned | Jun 24, 2015 | — |
Network & registry
Registry
Holder
- Organization
- Pittsburgh Supercomputing Center
- Handle
- PSC-Z
- Range
- 147.72.0.0/16
- Registration type
- Direct Allocation
- Record created
- Jul 5, 1991
- Legacy
- yes
Origin network
AS36407
US
- Name
- Software Engineering Institute
- Type
- Education
- Registered
- Dec 22, 2005
- Domain
- cmu.edu
- Industry
- Software Development
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced this prefix
Summary
Routing history
- Pattern
- Rotating
- First seen
- Aug 2015
- Current origin since
- Oct 2017 · 9.1 yr
- Origin networks
- 2
- Last change of origin
- Jul 2025
Recorded history
History
- Handoffs
- 3
- Also announced by
- 9
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 147.72.252.0/22 | AS9 | /24 | ARIN | Another network |
| 147.72.252.0/22 | AS36407 | /24 | ARIN | RPKI valid |
| 147.72.0.0/16 | AS5050 | /16 | ARIN | Another network |
IRR
Route objects on the exact prefix
IRR inside
Route objects inside
| Prefix | Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|---|
| 147.72.252.0/24 | AS36407 | ARIN | CERT-NET-147-72-252 | MNT-PSC-Z | Nov 15, 2024 |
Whois
Registration for this announcement
- Range
- 147.72.252.0/22
- Netname
- PSC-BLK72-252-22
- Registrant
- Software Engineering Institute
- Organization
- Software Engineering Institute (CERT-1)
- Org address
- Software Engineering Institute, Pittsburgh, PA, 15213
- Org country
- US
- Type
- Reassigned
- Handle
- NET-147-72-252-0-1
- Parent
- NET-147-72-0-0-1
- Created
- Jun 24, 2015
- RIR
- ARIN
- Country
- US
- Delegated
- Jul 5, 1991
- Status
- assigned
Report abuse
Abuse contact
- [email protected]
- Name
- No, Contact Known
- Phone
- +1-800-555-1234
- Handle
- CKN23-ARIN