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First identify what the hexadecimal string represents. If it is four raw bytes, decode it as IPv4; if it is 16 raw bytes, decode it as IPv6. For example, C0A80001 becomes the bytes C0 A8 00 01, which render in network byte order as 192.168.0.1. A hex-encoded text string or a value stored little-endian requires a different step.
Identify the kind of hexadecimal input
“Hexadecimal IP address” is ambiguous. Before converting, determine which of these formats you have:
- Raw address bytes:
C0A80001is four bytes and can represent IPv4.20010DB8000000000000000000000001is 16 bytes and can represent IPv6. - An integer:
0xC0A80001is a number. Interpreting that number as an IPv4 address assumes a defined byte order; network-order interpretation gives192.168.0.1. - Already formatted IPv6:
2001:0db8::1is already an IPv6 text address. Parse it as an IP address; do not split it as a raw hex blob. - Hex-encoded text:
3139322E3136382E312E31decodes to the ASCII characters192.168.1.1. Decode it as text first, then parse that address.
For raw, unseparated address bytes, IPv4 is 4 bytes (8 hex digits) and IPv6 is 16 bytes (32 hex digits). Requiring exactly those lengths is safer than silently padding a short value. The address-family and textual representation rules are described in RFC 4291.
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A safe conversion has three steps: normalize only the input forms your data contract permits, validate the hexadecimal characters and byte count, then pass the decoded bytes to an IP-address library. That library can validate the address length and format IPv6 correctly.
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Decide up front whether to accept an optional 0x prefix, whitespace, separators, or omitted leading zeroes. Do not blindly strip every non-hex character: doing so can turn malformed data into a different valid address. The examples below accept an optional 0x prefix and require otherwise contiguous hexadecimal digits.
Python
import ipaddress
def hex_to_ip(hex_string: str, family: int | None = None) -> str:
s = hex_string.strip()
if s.lower().startswith("0x"):
s = s[2:]
if not s or any(c not in "0123456789abcdefABCDEF" for c in s):
raise ValueError("Input is not a hexadecimal string")
if len(s) == 8:
if family not in (None, 4):
raise ValueError("8 hex digits represent IPv4, not IPv6")
return str(ipaddress.IPv4Address(bytes.fromhex(s)))
if len(s) == 32:
if family not in (None, 6):
raise ValueError("32 hex digits represent IPv6, not IPv4")
return str(ipaddress.IPv6Address(bytes.fromhex(s)))
raise ValueError("Expected 8 hex digits for IPv4 or 32 for IPv6")
print(hex_to_ip("C0A80001"))
# 192.168.0.1
print(hex_to_ip("20010DB8000000000000000000000001"))
# 2001:db8::1Python’s standard-library ipaddress module accepts packed bytes as well as integers. The byte-based function above makes the expected length explicit. If your source contract permits both address families, an explicit family argument is preferable to guessing: length-based detection is safe only when the input is known to be a raw, unseparated byte representation.
Go
package main
import (
"encoding/hex"
"fmt"
"net"
"strings"
)
func hexToIP(s string) (string, error) {
s = strings.TrimSpace(s)
if strings.HasPrefix(strings.ToLower(s), "0x") {
s = s[2:]
}
raw, err := hex.DecodeString(s)
if err != nil {
return "", err
}
switch len(raw) {
case net.IPv4len:
return net.IP(raw).String(), nil
case net.IPv6len:
return net.IP(raw).String(), nil
default:
return "", fmt.Errorf("expected 4 or 16 bytes, got %d", len(raw))
}
}
func main() {
ip, err := hexToIP("C0A80001")
if err != nil {
panic(err)
}
fmt.Println(ip) // 192.168.0.1
}Go’s net package uses four-byte IPv4 and 16-byte IPv6 values and formats valid addresses through IP.String(). An address library may have an internal representation that differs from its displayed form; use its documented conversion and formatting methods rather than inferring the family from internal storage alone.
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C# / .NET
using System;
using System.Linq;
using System.Net;
static string HexToIp(string input)
{
string s = input.Trim();
if (s.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
s = s[2..];
if (s.Length % 2 != 0 || s.Any(c => !Uri.IsHexDigit(c)))
throw new ArgumentException("Invalid hexadecimal input");
byte[] bytes = Convert.FromHexString(s);
if (bytes.Length != 4 && bytes.Length != 16)
throw new ArgumentException("Expected 4 or 16 bytes");
return new IPAddress(bytes).ToString();
}IPAddress.Parse parses textual IP notation, not an arbitrary raw hex blob. Decode the raw hex to bytes first, as above. Convert.FromHexString is available in modern .NET; check the target framework if supporting older projects.
JavaScript and Node.js
For an 8-digit IPv4 value, the bytes can be converted directly to decimal octets:
function hexToIPv4(hex) {
const s = hex.trim().replace(/^0x/i, "");
if (!/^[0-9a-f]{8}$/i.test(s)) {
throw new Error("Expected exactly 8 hexadecimal digits for IPv4");
}
return s.match(/../g)
.map(pair => parseInt(pair, 16))
.join(".");
}
console.log(hexToIPv4("C0A80001")); // 192.168.0.1For IPv6, use a maintained IP-address library that accepts bytes and implements IPv6 formatting, or output expanded notation using eight groups of four hex digits. Do not claim that simply inserting colons produces canonical compressed IPv6. JavaScript’s ordinary Number cannot exactly represent every 128-bit value; use bytes or BigInt for integer input, never floating-point arithmetic.
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Node’s node:net IP validation functions are for already formatted address strings: net.isIP(text) returns 4, 6, or 0. They do not decode an unseparated raw hex value.
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Manual conversion for understanding and debugging
IPv4
Take 7F000001 and split it into two-digit bytes:
7F 00 00 01Convert each pair from base 16 to base 10: 7F is 127, 00 is 0, and 01 is 1. The result is 127.0.0.1. For each pair, the value is 16 × first hex digit + second hex digit, with A through F representing 10 through 15.
IPv6
Split the 32 digits in 20010DB8000000000000000000000001 into eight 16-bit groups:
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2001 0DB8 0000 0000 0000 0000 0000 0001Adding colons gives the expanded address 2001:0DB8:0000:0000:0000:0000:0000:0001. A formatter can remove leading zeroes in each group and compress a run of zero groups, producing 2001:db8::1. IPv6 compression has rules for which zero run to compress and permits only one ::; use a standards-aware library in production rather than a quick string replacement.
Byte order: the conversion’s most important assumption
The byte-pair examples assume network byte order (big-endian): the first byte in the input is the first address octet. Thus:
C0 A8 00 01 → 192.168.0.1If a source stores the same 32-bit value little-endian, the observed byte sequence could be 01 00 A8 C0, which renders as 1.0.168.192. Hex notation alone does not tell you which interpretation is correct. Check the protocol, database schema, file format, or serialization code that produced the value. If reversal is required, make it an explicit source-specific operation; reversing all 16 bytes is not a general IPv6 rule.
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For a big-endian integer-to-IPv4 conversion, the octets are:
octet_1 = (value >> 24) & 0xff
octet_2 = (value >> 16) & 0xff
octet_3 = (value >> 8) & 0xff
octet_4 = value & 0xffKeep values within the intended range: IPv4 is 32 bits, up to FFFFFFFF; IPv6 is 128 bits, up to 32 hexadecimal F characters. Check the range explicitly in languages with arbitrary-precision integers, too.
Common edge cases and mistakes
- Wrong length:
C0A8000has an odd number of digits;C0A8000100is five bytes. Reject them unless the input format explicitly defines another representation. - Invalid characters:
GG000001is not hexadecimal. Validate before decoding. - Missing leading zeroes:
C0A801could be padded to00C0A801only under a contract that permits that interpretation. Do not silently pad it. - Separators:
C0:A8:00:01,C0-A8-00-01, andC0 A8 00 01are not the contiguous format used by the examples. Normalize them only if the source specification permits those separators. - IPv4-mapped IPv6:
00000000000000000000FFFFC0A80001is a 16-byte IPv6 representation that can display as::ffff:192.168.0.1. Do not automatically treat it as identical to a four-byte IPv4 value for logging, comparisons, or access-control decisions. See RFC 4291 and your library’s address-family behavior. - IPv6 scope identifiers: a link-local address may need a zone such as
%1to identify an interface. That scope is separate from the raw 16 address bytes; supply and preserve it according to the target API. Python documents scoped addresses in its IP address module. - Ports:
C0A80001:1F90could be intended as an address plus a hexadecimal port, but that is not an IP-address encoding by itself. Parse endpoint formats according to their specification; IPv6 endpoints commonly put the address in brackets, as in[2001:db8::1]:8080. - Hex-encoded text: decode
3139322E3136382E312E31to text first. It represents the characters “192.168.1.1,” not the four binary bytes of that address.
Test cases
For a big-endian raw-byte converter, these results provide useful checks:
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|---|---|---|
00000000 |
IPv4 | 0.0.0.0 |
7F000001 |
IPv4 | 127.0.0.1 |
C0A80001 |
IPv4 | 192.168.0.1 |
FFFFFFFF |
IPv4 | 255.255.255.255 |
00000000000000000000000000000001 |
IPv6 | ::1 |
20010DB8000000000000000000000001 |
IPv6 | 2001:db8::1 |
Also test rejection of odd-length input, invalid characters, and lengths other than 8 or 32 digits. Include cases from your own source format for byte order and family selection; a syntactically valid address can still be the wrong interpretation of the stored data.
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