is_private

Checks whether an IP address is a private address.

is_private(x:ip) -> bool

Description

The is_private function checks whether a given IP address x is a private address according to RFC 1918 (IPv4) and RFC 4193 (IPv6).

For IPv4, private addresses are:

• 10.0.0.0/8 (10.0.0.0 - 10.255.255.255)
• 172.16.0.0/12 (172.16.0.0 - 172.31.255.255)
• 192.168.0.0/16 (192.168.0.0 - 192.168.255.255)

For IPv6, private addresses are:

• fc00::/7 (Unique Local Addresses)

Note: Link-local addresses (169.254.0.0/16 for IPv4 and fe80::/10 for IPv6) are not considered private addresses by this function.

Examples

Check if an IP is private

from {
  private_10: 10.0.0.1.is_private(),
  private_172: 172.16.0.1.is_private(),
  private_192: 192.168.1.1.is_private(),
  private_ipv6: fc00::1.is_private(),
  link_local: 169.254.1.1.is_private(),
  public: 8.8.8.8.is_private(),
}

{
  private_10: true,
  private_172: true,
  private_192: true,
  private_ipv6: true,
  link_local: false,
  public: false,
}

See Also

is_v4, is_v6, is_multicast, is_loopback, is_global, is_link_local, ip_category