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Look up authoritative registration records for a domain, IP, network prefix or ASN. Subdomains are resolved to their registrable domain automatically.
AS4000
Record foundARINCOGENT-4000
RDAP is structured authoritative registration data. Registration records and contacts do not establish current routing, device location or network safety.- Resource type
- Autonomous system
- Registry
- ARIN
- Registration country / region
- Not provided by registry
- Registration status
- Active
- Registered at
- 11/4/1994, 05:00:00
- Last changed
- 12/23/2025, 15:12:52
Resource rangeAS4000 – AS4005Autonomous system
Resource records6ASN count
Public contacts4Published by the registry
Registry events2Authoritative change record
Authoritative registration details
- Registry handle
- AS4000
- Name
- COGENT-4000
- Allocation type
- Not provided by registry
- Parent handle
- Not provided by registry
- Whois server
- whois.arin.net
- Authoritative RDAP host
- rdap.arin.net
- Resource range
- AS4000 – AS4005
- Address family
- Not applicable
- Resource records
- Not applicable
Registration and change events
2 eventsTerms and remarks
Registry notices are shown verbatim so their authoritative meaning is not altered.
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