'A', $first < 192 => 'B', $first < 224 => 'C', $first < 240 => 'D (Multicast)', default => 'E (Reserved)', }; $ip_long = ip2long($ipv4); $bin = implode('.', array_map(fn($o) => sprintf('%08b', $o), $octets)); $is_private = is_private_ip($ipv4); } require_once __DIR__ . '/header.php'; ?>
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IPv4 Address
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Hexadecimal strtoupper(sprintf('%02x', $o)), $octets)) ?>
Binary
IP ClassClass
Type Private / RFC1918' : 'Public' ?>
Provider & Network
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Hostname / PTR
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What is an IPv4 address?

IPv4 (Internet Protocol version 4) uses 32-bit addresses written as four numbers separated by dots (e.g. 192.168.1.1). There are approximately 4.3 billion possible IPv4 addresses. Since these are nearly exhausted, IPv6 with 128-bit addresses was introduced. Your IPv4 address is assigned by your ISP and can be static (always the same) or dynamic (changes regularly).