IP Calculator

8.8.8.8 is a class A address in Public.

How it works

• Parsed the four octets and combined them into one unsigned 32-bit integer.
• Rendered that integer in decimal, hexadecimal, binary and octal.
• Classified the address by its first octet and its documented special-use range.
• Reversed the octets to build the in-addr.arpa reverse-DNS name.

value = (((o1 × 256 + o2) × 256 + o3) × 256 + o4)

• Class labels are legacy (pre-CIDR) and do not imply routing policy.
• Leading-zero octets are rejected because they are ambiguous between decimal and octal.

Methodology

1. Parse the address with a strict dotted-quad grammar.
2. Combine the octets into one unsigned 32-bit integer without signed-shift overflow.
3. Render the integer in decimal, hexadecimal, binary and octal.
4. Classify by first octet and documented special-use range, then build the reverse-DNS name.

Usage

1. Enter an IPv4 address.
2. Run the calculation.
3. Read or copy the address properties.

Examples

These are examples, not current values: they use fixed inputs, while the interactive tool computes live results in your browser.

A public DNS resolver

{
  "address": "8.8.8.8"
}

A private address

{
  "address": "192.168.1.1"
}

The loopback address

{
  "address": "127.10.20.30"
}

Limitations

One integer, many notations

An IPv4 address is a 32-bit number. The dotted quad is a human-readable way of writing four bytes, but the address also has a decimal integer, a hexadecimal and a binary form. Systems disagree about which one to store, so being able to see all of them is useful.

The reverse-DNS name is built from the same bytes: the octets are reversed and appended to in-addr.arpa so the lookup tree reads most-specific first.