AS399358 Anthropic, PBC
AS399358 (ANTHROPIC) is registered to Anthropic, PBC in US, through ARIN. It originates 3 prefixes in the global routing table.
1
IPv4 prefixes
2
IPv6 prefixes
512
IPv4 addresses
100%
RPKI valid
Registration
Who holds AS399358
Names from RIPE NCC’s daily list of every allocated AS number. The ASN lookup fetches the full WHOIS record live.
AS number
AS399358
Handle
ANTHROPIC
Organization
Anthropic, PBC
Country
US
Registry
ARIN
ASPA
None published
WHOIS recordARIN
# # ARIN WHOIS data and services are subject to the Terms of Use # available at: https://www.arin.net/resources/registry/whois/tou/ # # If you see inaccuracies in the results, please report at # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/ # # Copyright 1997-2026, American Registry for Internet Numbers, Ltd. # ASNumber: 399358 ASName: ANTHROPIC ASHandle: AS399358 RegDate: 2023-09-20 Updated: 2024-01-08 Comment: -----BEGIN CERTIFICATE-----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-----END CERTIFICATE----- Ref: https://rdap.arin.net/registry/autnum/399358 OrgName: Anthropic, PBC OrgId: AP-2440 Address: 548 Market St. Address: PMB 90375 City: San Francisco StateProv: CA PostalCode: 94104-5401 Country: US RegDate: 2023-07-31 Updated: 2023-08-22 Ref: https://rdap.arin.net/registry/entity/AP-2440 OrgRoutingHandle: ANTHR5-ARIN OrgRoutingName: Anthropic OrgRoutingPhone: +1-415-236-0599 OrgRoutingEmail: arin@anthropic.com OrgRoutingRef: https://rdap.arin.net/registry/entity/ANTHR5-ARIN OrgDNSHandle: ANTHR5-ARIN OrgDNSName: Anthropic OrgDNSPhone: +1-415-236-0599 OrgDNSEmail: arin@anthropic.com OrgDNSRef: https://rdap.arin.net/registry/entity/ANTHR5-ARIN OrgAbuseHandle: ANTHR5-ARIN OrgAbuseName: Anthropic OrgAbusePhone: +1-415-236-0599 OrgAbuseEmail: arin@anthropic.com OrgAbuseRef: https://rdap.arin.net/registry/entity/ANTHR5-ARIN OrgNOCHandle: ANTHR5-ARIN OrgNOCName: Anthropic OrgNOCPhone: +1-415-236-0599 OrgNOCEmail: arin@anthropic.com OrgNOCRef: https://rdap.arin.net/registry/entity/ANTHR5-ARIN OrgTechHandle: ANTHR5-ARIN OrgTechName: Anthropic OrgTechPhone: +1-415-236-0599 OrgTechEmail: arin@anthropic.com OrgTechRef: https://rdap.arin.net/registry/entity/ANTHR5-ARIN # # ARIN WHOIS data and services are subject to the Terms of Use # available at: https://www.arin.net/resources/registry/whois/tou/ # # If you see inaccuracies in the results, please report at # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/ # # Copyright 1997-2026, American Registry for Internet Numbers, Ltd. #
Routing
What AS399358 announces
Prefixes originated by AS399358 in the RouteViews table (refreshed every four hours), each checked against the RPKI (every ten minutes) and the IRR (daily).
IPv4 prefixes
1
IPv6 prefixes
2
IPv4 addresses
512 (2 /24s)
RPKI valid
3 100%
RPKI invalid
0
RPKI not found
0
ROAs naming AS399358
4
With an IRR route object
2 66%
Prefixes
Announced prefixes
Each opens its own page: who announces it, the paths our collectors see, its ROAs and route objects.
IPv4 (1)
IPv6 (2)
RPKI valid RPKI invalid no ROA covers it
Neighbors
Who AS399358 is reached through
The AS just before AS399358 in the paths our looking glass collectors hold, for 3 of its prefixes. Usually a transit provider, sometimes a peer. The number is how many of those prefixes it was seen on.
IRR
Routing registry objects
From the mirrored IRR databases (RADB, the five RIRs and more). Look it up live.
Route objects with origin AS399358: ARIN 6 · RADB 2
as-sets that list AS399358 (6)