ipFamily: Check whether an address is IPv4 or IPv6

In httpuv: HTTP and WebSocket Server Library

Check whether an address is IPv4 or IPv6

Description

Given an IP address, this checks whether it is an IPv4 or IPv6 address.

Usage

ipFamily(ip)

Arguments

ip	A single string representing an IP address.

Value

For IPv4 addresses, 4; for IPv6 addresses, 6. If the address is neither, -1.

Examples

ipFamily("127.0.0.1")   # 4
ipFamily("500.0.0.500") # -1
ipFamily("500.0.0.500") # -1

ipFamily("::")          # 6
ipFamily("::1")         # 6
ipFamily("fe80::1ff:fe23:4567:890a") # 6

httpuv documentation built on April 16, 2025, 9:07 a.m.