Which input formats does it accept?

It accepts a dotted IPv4 address, an IPv6 address (compressed or expanded), an IP expressed as a decimal integer, a hexadecimal value prefixed with 0x, and a CIDR block like 10.0.0.0/24. The format is detected automatically and shown as a badge above the results.

What does the reverse-DNS (PTR) value give me?

It is the PTR name used for reverse DNS lookups — for IPv4 the octets are reversed under in-addr.arpa, and for IPv6 the nibbles are reversed under ip6.arpa. This is the name you would configure or query to map an address back to a hostname.

What network details does a CIDR block produce?

For a CIDR block the tool shows the network address, broadcast address (IPv4), the first and last host, the total and usable host counts, the netmask, and the wildcard mask. This is everything you need to reason about the size and boundaries of a subnet.

How does it classify an address?

Badges indicate the IPv4 class (A/B/C/etc.), whether the address is private or public, and whether it is loopback or reserved. For IPv6 it flags loopback and whether the address is private or global, so you can tell the scope at a glance.

Can it convert between IPv4 and IPv6?

It analyses whichever version you enter and produces that version’s conversions and classifications. It is designed to expand, compress, and convert within a version and to expand CIDR ranges, rather than to map an address from one IP version to the other.

Is the address sent to any server for a lookup?

No. All detection, conversion, classification, and CIDR math happen entirely in your browser. The tool computes the PTR name and network details locally and does not perform live DNS queries or send the address anywhere.

IP Address Converter

Paste any IPv4 or IPv6 address, an IP as an integer, a 0x hex value, or a CIDR block — it auto-detects the format and converts live to dotted, integer, hex, binary, and reverse-DNS forms. See address class and private/public/loopback/reserved flags, expand network details for CIDR ranges, and copy any value or pipe the whole thing as JSON. Runs entirely in your browser.

About this ToolHow it works, benefits & use cases

Feed this converter an IPv4 or IPv6 address, an IP written as a decimal integer, a 0x hexadecimal value, or a CIDR block, and it auto-detects the format and converts it live. For IPv4 you get dotted decimal, the 32-bit integer, hexadecimal, full binary, and the reverse-DNS (PTR) name; for IPv6 you get the compressed and fully-expanded forms, the integer, hexadecimal, and PTR. Alongside the conversions, badges classify the address — its class, whether it is private, public, loopback, or reserved (global for IPv6) — so you immediately know what kind of address you are looking at. Give it a CIDR block and it expands the network: network and broadcast addresses, first and last host, total and usable host counts, netmask, and wildcard mask. Every value is copyable and the full analysis exports as JSON, all computed in your browser.

How to Use

1Type or paste an address into the input — a dotted IPv4, an IPv6 address, a decimal integer, a 0x hex value, or a CIDR block.
2Read the detected-format badge and the classification flags (class, private/public, loopback, reserved).
3Copy any conversion card — dotted, integer, hex, binary, or reverse-DNS (PTR).
4For a CIDR block, expand the Network details for network/broadcast, first/last host, host counts, netmask, and wildcard.
5Use the example buttons to try common inputs, then copy/download/pipe the full analysis as JSON.

Key Benefits

Auto-detects dotted IP, integer, 0x hex, IPv6, and CIDR input formats
IPv4 conversions: dotted, integer, hex, binary, and reverse-DNS PTR
IPv6 conversions: compressed, fully expanded, integer, hex, and PTR
Classification flags: class, private/public, loopback, and reserved
CIDR expansion: network, broadcast, host range, counts, netmask, and wildcard
Every value copyable; full analysis exports as JSON
All computation runs locally in your browser

Common Use Cases

Converting an IP stored as an integer in a database back to dotted notation
Working out the host range and usable count for a CIDR block when planning a subnet
Generating the reverse-DNS PTR name for an address
Checking whether an address is private, loopback, or reserved before using it
Expanding or compressing an IPv6 address to a canonical form

IP address, integer, hex, or CIDRDetected IPv4 address

Auto-detects the format — try a dotted IP, a decimal integer, a 0x hex value, an IPv6 address, or a CIDR block.

Class CPrivate

Analysis (JSON)

Copy, download, or pipe to JSON Formatter / JSON to TypeScript.

{
  "ok": true,
  "input": "192.168.1.1",
  "version": 4,
  "kind": "address",
  "ipv4": {
    "dotted": "192.168.1.1",
    "integer": "3232235777",
    "hex": "0xC0A80101",
    "binary": "11000000.10101000.00000001.00000001",
    "class": "C",
    "isPrivate": true,
    "isLoopback": false,
    "isReserved": false,
    "ptr": "1.1.168.192.in-addr.arpa"
  }
}

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IP Address Converter

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Key Benefits

Common Use Cases

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