What is ASN AS399358?

ASN AS399358 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS399358?

AS399358 is listed under Anthropic, PBC.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS399358 Anthropic, PBC | IPGeolocation.io

ASN Lookup Tool

Anthropic, PBC anthropic.com

US 4 Routes

AS Data

AS399358

AS399358 – Anthropic, PBC

AS Number	399358
AS Name	ANTHROPIC
Organization	Anthropic, PBC(ap-2440)
Country	US
Website	anthropic.com
Number of IPv4 Routes	2
Number of IPv6 Routes	2
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2023-09-20

ASN Intelligence API for production workflows

Use ASN data for AS399358 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

Get ASN API Key ASN API Docs

IP Ranges

Route	Origin	Origin Name	ISP	# IPs
2607:6bc0::/48	AS399358	Anthropic, PBC	Anthropic, PBC	~1×10²⁴
209.249.57.0/24	AS399358	Anthropic, PBC	Mitel Networks, Inc.	256
160.79.104.0/23	AS399358	Anthropic, PBC	Anthropic, PBC	512
2607:6bc0:11::/48	AS399358	Anthropic, PBC	Anthropic, PBC	~1×10²⁴

Raw Whois Response

#
# 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


OrgTechHandle: ANTHR5-ARIN
OrgTechName:   Anthropic
OrgTechPhone:  +1-415-236-0599 
OrgTechEmail:  arin@anthropic.com
OrgTechRef:    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

OrgDNSHandle: ANTHR5-ARIN
OrgDNSName:   Anthropic
OrgDNSPhone:  +1-415-236-0599 
OrgDNSEmail:  arin@anthropic.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/ANTHR5-ARIN

OrgRoutingHandle: ANTHR5-ARIN
OrgRoutingName:   Anthropic
OrgRoutingPhone:  +1-415-236-0599 
OrgRoutingEmail:  arin@anthropic.com
OrgRoutingRef:    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


#
# 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.
#

Parsed Whois Response

Peers

AS Number	Description	Country
AS13335	Cloudflare, Inc.	US
AS1239	Cogent Communications, LLC	US
AS6461	Zayo Bandwidth	US
AS174	Cogent Communications, LLC	US

Upstreams

AS Number	Description	Country
AS13335	Cloudflare, Inc.	US
AS6461	Zayo Bandwidth	US
AS174	Cogent Communications, LLC	US