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Claude Platform on AWS: The inbound endpoint (aws-external-anthropic.{region}.api.aws) resolves to AWS IP ranges. Outbound tool calls (MCP connector, web search, and web fetch) originate from the Anthropic ranges listed on this page. See the AWS IP address ranges for inbound allowlisting.

Inbound IP addresses

These are the IP addresses where Anthropic services receive incoming connections.

IPv4

160.79.104.0/23

IPv6

2607:6bc0::/48

Outbound IP addresses

These are the stable IP addresses that Anthropic uses for outbound requests (for example, when making MCP tool calls to external servers).

IPv4

160.79.104.0/21

Phased out IP addresses

The following IP addresses are no longer in use by Anthropic. If you have previously allowlisted these addresses, you should remove them from your firewall rules.

34.162.46.92/32
34.162.102.82/32
34.162.136.91/32
34.162.142.92/32
34.162.183.95/32

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URL: https://platform.claude.com/docs/en/api/ip-addresses

⇱ IP addresses - Claude API Docs

Inbound IP addresses

IPv4

IPv6

Outbound IP addresses

IPv4

Phased out IP addresses