Pfx.link_local-question-mark

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link_local?(pfx)

Specs

link_local?(prefix()) :: boolean()

Returns true if pfx is a link-local prefix, false otherwise

Link local prefixes include:

0.0.0.0/8, rfc1122, 'this-network'
255.255.255.255/32, rfc1122, limited broadcast
169.254.0.0/16, rfc3927, link-local (see examples)
fe80::/64, rfc4291, link-local

Examples

# first 256 addresses are reserved
iex> link_local?("169.254.0.0")
false

# last 256 addresses are reserved
iex> link_local?("169.254.255.0")
false

# rest is considered link local
iex> link_local?("169.254.1.0")
true

iex> link_local?("169.254.254.255")
true

iex> link_local?("0.0.0.0")
true

iex> link_local?("0.255.255.255")
true

iex> link_local?({0, 255, 255, 255})
true

iex> link_local?("fe80::acdc:1975")
true

iex> link_local?("1.1.1.1")
false

# bad prefix
iex> link_local?("10.10.10.256")
false