inet_addr - The Open Group
https://pubs.opengroup.org/onlinepubs/7908799/xns/inet_addr.html
WebDESCRIPTION. The inet_addr () function converts the string pointed to by cp, in the Internet standard dot notation, to an integer value suitable for use as an Internet address. The inet_lnaof () function takes an Internet host address specified by in and extracts the local network address part, in host byte order.
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