Python 3.3+ipaddressfunction

ipaddress.v6_int_to_packed()

packing to bytes

Converts an integer into the 16 bytes of an IPv6 address in network (big-endian) order.

Syntax

ipaddress.v6_int_to_packed(address)

The result is always exactly 16 bytes, even for small numbers: the address ::1 is fifteen zero bytes and a one. Numbers outside 0..2**128-1 raise ValueError. IPv6Address(b) reads the bytes back; note that ip_address() picks IPv4 for 4-byte input and IPv6 for 16-byte input.

Examples

import ipaddress
b = ipaddress.v6_int_to_packed(1)
print(len(b), b[-1])  # → 16 1
print(ipaddress.IPv6Address(b))  # → ::1
ipaddress.v6_int_to_packed(2 ** 128)  # → ValueError: Address negative or too large for IPv6

See also

Common errors

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