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How to Perform a DNS Lookup for A Records in Python

Resolve a hostname to IPv4 A records using Python's built-in socket.getaddrinfo and return a sorted list of addresses.

import socket

def get_a_records(hostname):
    """Fetch A records (IPv4 addresses) for a given hostname."""
    try:
        # getaddrinfo with family AF_INET restricts to IPv4 (A records)
        infos = socket.getaddrinfo(hostname, None, socket.AF_INET)
        # Each info tuple: (family, type, proto, canonname, so…

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