7.19. IP Functions

• ip_prefix(ip_address, prefix_bits) → ipprefix
• Returns the IP prefix of a given ip_address with subnet size of prefix_bits.ip_address can be either of type VARCHAR or type IPADDRESS.

  SELECT ip_prefix(CAST('192.168.255.255' AS IPADDRESS), 9); — {192.128.0.0/9}
  SELECT ip_prefix('2001:0db8:85a3:0001:0001:8a2e:0370:7334', 48); — {2001:db8:85a3::/48}

• ip_subnet_min(ip_prefix) → ip_address
• Returns the smallest IP address of type IPADDRESS in the subnetspecified by ip_prefix.

  SELECT ip_subnet_min(IPPREFIX '192.168.255.255/9'); — {192.128.0.0}
  SELECT ip_subnet_min(IPPREFIX '2001:0db8:85a3:0001:0001:8a2e:0370:7334/48'); — {2001:db8:85a3::}

• ip_subnet_max(ip_prefix) → ip_address
• Returns the largest IP address of type IPADDRESS in the subnetspecified by ip_prefix.

  SELECT ip_subnet_max(IPPREFIX '192.64.0.0/9'); — {192.127.255.255}
  SELECT ip_subnet_max(IPPREFIX '2001:0db8:85a3:0001:0001:8a2e:0370:7334/48'); — {2001:db8:85a3:ffff:ffff:ffff:ffff:ffff}

• ip_subnet_range(ip_prefix) -> array(ip_address)
• Return an array of 2 IP addresses.The array contains the smallest and the largest IP addressin the subnet specified by ip_prefix.

  SELECT ip_subnet_range(IPPREFIX '1.2.3.160/24'); — [{1.2.3.0}, {1.2.3.255}]
  SELECT ip_subnet_range(IPPREFIX '64:ff9b::52f4/120'); — [{64:ff9b::5200}, {64:ff9b::52ff}]

• is_subnet_of(ip_prefix, ip_address) → boolean
• Returns true if the ip_address is in the subnet of ip_prefix.

  SELECT is_subnet_of(IPPREFIX '1.2.3.128/26', IPADDRESS '1.2.3.129'); — true
  SELECT is_subnet_of(IPPREFIX '64:fa9b::17/64', IPADDRESS '64:ffff::17'); — false

• is_subnet_of(ip_prefix1, ip_prefix2) → boolean
• Returns true if ip_prefix2 is a subnet of ip_prefix1.

  SELECT is_subnet_of(IPPREFIX '192.168.3.131/26', IPPREFIX '192.168.3.144/30'); — true
  SELECT is_subnet_of(IPPREFIX '64:ff9b::17/64', IPPREFIX '64:ffff::17/64'); — false
  SELECT is_subnet_of(IPPREFIX '192.168.3.131/26', IPPREFIX '192.168.3.131/26'); — true