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tm_cidrnetmask Function ​

tm_cidrnetmask converts an IPv4 address prefix given in CIDR notation into a subnet mask address.

hcl
tm_cidrnetmask(prefix)

prefix must be given in IPv4 CIDR notation, as defined in RFC 4632 section 3.1.

The result is a subnet address formatted in the conventional dotted-decimal IPv4 address syntax, as expected by some software.

CIDR notation is the only valid notation for IPv6 addresses, so cidrnetmask produces an error if given an IPv6 address.

INFO

As a historical accident, this function interprets IPv4 address octets that have leading zeros as decimal numbers, which is contrary to some other systems which interpret them as octal. We have preserved this behavior for backward compatibility, but recommend against relying on this behavior.

Examples ​

sh
tm_cidrnetmask("172.16.0.0/12")
255.240.0.0
  • tm_cidrhost calculates a full host IP address within a given IP network address prefix.
  • tm_cidrsubnet calculates a subnet address under a given network address prefix.
  • tm_cidrsubnets calculates a sequence of consecutive IP address ranges within a particular CIDR prefix.
  • tm_cidrcontains determines whether a given IP address or an address prefix given in CIDR notation is within a given IP network address prefix.