Module address 

Private address checks for attachment downloads and webhook hosts.

address-registry.txt is a snapshot of the IANA IPv4 and IPv6 registries: https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml Both <updated> values were 2025-10-09 when checked on 2026-09-25. Refresh the snapshot when either <updated> value changes. A longer entry overrides its parent entry.

Constants

NAT64_DISCOVERY_NAME

RFC 7050 §2.2: a DNS64 synthesizes this name’s AAAA under its NAT64 prefix.

Functions

discover_nat64

The prefixes in a NAT64_DISCOVERY_NAME answer. No lookup, a failed one, or one slower than 5 seconds adds no prefix.

is_private

Return true for an address that must not be reached by a default client.

is_private_behind

is_private, or under a discovered NAT64 prefix with a private IPv4 address.