Converts an IPv4 address to a line of chainparamsseeds.h to check if your node is a seed of Bitcoin Core client

ip2chainparamsseeds.py

#!/usr/bin/python3
#
# Converts an IPv4 address to the format of the file ``chainparamsseeds.h``
# to know if your node is a seed in Bitcoin Core client's seeds.
#
# This file is automatically created by ``generate-seeds.py``
#
# Sources:
# https://github.com/bitcoin/bitcoin/blob/v0.16.3/src/chainparamsseeds.h
# https://github.com/bitcoin/bitcoin/tree/v0.16.3/contrib/seeds
# https://github.com/bitcoin/bitcoin/blob/v0.16.3/contrib/seeds/generate-seeds.py
#
# Usage:
# python ip2chainparamsseeds.py 0.0.0.0
import sys

FORMAT = "{{{{"+ "0x{:02x},"*15 + "0x{:02x}}}, {:d}}}"

def ip_to_seed(ip: str, port: int = 8333) -> str:
    """Converts an IP address and port into the ``chainparamsseeds.h`` format.

    Just IPv4 dotted-quad addresses are understood.
    """
    num_vals = [0 for _ in range(16)]
    quad_vals = bytes(int(i) for i in ip.split("."))
    num_vals[-6:-4] = 0xff, 0xff
    num_vals[-4:] = quad_vals
    return FORMAT.format(*num_vals, port)

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Usage:")
        print("ip2chainparamsseeds.py 0.0.0.0")
    ip = sys.argv[1]
    print(ip_to_seed(ip))