Network Tools

IP Address Lookup

Look up geolocation, ISP, and network details for any IP address. Supports your own IP or any IPv4 — see country, city, region, and org instantly.

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IP address

Leave blank to look up your own IP

Enter an IP address or click 'My IP' to look up

Internet Protocol Architecture: IPv4, IPv6 & Geolocation

An Internet Protocol (IP) address is a numerical label assigned to every device connected to a computer network relying on the Internet Protocol for communication. IP addresses serve two primary functions: host or network interface identification and location addressing.

IPv4 vs IPv6 Technical Comparison

Specification	IPv4 (RFC 791)	IPv6 (RFC 8200)
Address Length	32 bits (4 bytes)	128 bits (16 bytes)
Address Space	$2^{32} \approx 4.29 \times 10^9$ addresses	$2^{128} \approx 3.4 \times 10^{38}$ addresses
Notation Format	Dotted-decimal: `192.0.2.1`	Hexadecimal groups: `2001:0db8:85a3::8a2e:0370:7334`
Header Size	20 to 60 bytes (variable)	40 bytes (fixed)
Configuration	Manual or DHCP	Stateless Address Autoconfiguration (SLAAC) or DHCPv6

Public vs Private IP Address Ranges (RFC 1918)

Private IP addresses are reserved for internal local area networks (LANs) and cannot be routed across the public internet:

10.0.0.0 – 10.255.255.255 (Class A 24-bit block)
172.16.0.0 – 172.31.255.255 (Class B 20-bit block)
192.168.0.0 – 192.168.255.255 (Class C 16-bit block)
127.0.0.1 (Localhost loopback address)

How IP Geolocation Works

IP geolocation estimates a device's physical geographic location by querying Regional Internet Registries (such as RIPE, ARIN, APNIC) and ISP routing announcements (BGP). While country and city-level lookups are highly accurate, IP addresses do not disclose exact street addresses or personal identities.

Inspecting IP Addresses via Command Line

# Retrieve public IP address
curl -s https://api.ipify.org

# Trace network route hops
traceroute 1.1.1.1
# or on Windows
tracert 1.1.1.1

Network Routing, Subnetting & CIDR Notation

Classless Inter-Domain Routing (CIDR): Subnet masks designate the network prefix length (e.g. /24 represents 256 addresses; /16 represents 65,536 addresses).
Loopback & Link-Local Addresses: Addresses like 127.0.0.1 (IPv4) or ::1 (IPv6) represent internal loopback interfaces, while 169.254.0.0/16 indicates APIPA self-assigned link-local addresses when DHCP fails.
BGP Autonomous System Numbers (ASN): Every public IP belongs to an Autonomous System (e.g. AS13335 for Cloudflare) managed through Border Gateway Protocol routing policies.

Frequently Asked Questions

What is the difference between IPv4 and IPv6 addresses?: IPv4 uses 32-bit addresses formatted as four decimal numbers separated by periods (e.g. 192.0.2.1), supporting approximately 4.3 billion unique devices. IPv6 uses 128-bit addresses represented in eight groups of hexadecimal digits (e.g. 2001:0db8::8a2e:0370:7334), providing virtually unlimited address space to accommodate modern internet growth.
How accurate is geographic IP lookup?: IP geolocation is generally 95% to 99% accurate at the country level, and roughly 60% to 80% accurate at the state, province, or city level. Accuracy depends on ISP routing tables, mobile carrier gateways, and proxy networks. It never reveals an exact physical street address.
Can someone find my personal identity from my IP address?: No. An IP address only identifies a network connection or internet service provider. Only your ISP possesses subscriber records linking an IP assignment to a billing address, and ISPs only disclose that information pursuant to a valid legal warrant.
What information is shown for an IP?: The lookup returns geolocation (city, region, country), ISP/organization, autonomous system number (ASN), timezone, and whether the IP is from a VPN, proxy, or Tor node.
How accurate is IP geolocation?: City-level accuracy is typically 50–80%. Country-level accuracy is over 99% for most IPs. VPNs and proxies can skew results.
Can I look up my own IP?: Yes. Leave the input blank or click 'My IP' to look up your current public IP address.
What data sources are used?: This tool queries the ipapi.co geolocation API, which aggregates data from multiple regional internet registries (RIRs).

Accuracy & Advisory Notice: IP Address Lookup

This website and utility are provided for general informational, calculation, and educational purposes only. Always verify critical computation outputs prior to professional deployment or financial use. See our Terms of Service and Privacy Policy for full governance details.

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Internet Protocol Architecture: IPv4, IPv6 & Geolocation

IPv4 vs IPv6 Technical Comparison

Specification

IPv4 (RFC 791)

IPv6 (RFC 8200)

Address Length

32 bits (4 bytes)

128 bits (16 bytes)

Address Space

$2^{32} \approx 4.29 \times 10^9$ addresses

$2^{128} \approx 3.4 \times 10^{38}$ addresses

Notation Format

Dotted-decimal: 192.0.2.1

Hexadecimal groups: 2001:0db8:85a3::8a2e:0370:7334

Header Size

20 to 60 bytes (variable)

40 bytes (fixed)

Configuration

Manual or DHCP

Stateless Address Autoconfiguration (SLAAC) or DHCPv6

Public vs Private IP Address Ranges (RFC 1918)

Private IP addresses are reserved for internal local area networks (LANs) and cannot be routed across the public internet:

10.0.0.0 – 10.255.255.255 (Class A 24-bit block)

172.16.0.0 – 172.31.255.255 (Class B 20-bit block)

192.168.0.0 – 192.168.255.255 (Class C 16-bit block)

127.0.0.1 (Localhost loopback address)

How IP Geolocation Works

Network Routing, Subnetting & CIDR Notation

Classless Inter-Domain Routing (CIDR): Subnet masks designate the network prefix length (e.g. /24 represents 256 addresses; /16 represents 65,536 addresses).

Loopback & Link-Local Addresses: Addresses like 127.0.0.1 (IPv4) or ::1 (IPv6) represent internal loopback interfaces, while 169.254.0.0/16 indicates APIPA self-assigned link-local addresses when DHCP fails.

BGP Autonomous System Numbers (ASN): Every public IP belongs to an Autonomous System (e.g. AS13335 for Cloudflare) managed through Border Gateway Protocol routing policies.

Frequently Asked Questions

What is the difference between IPv4 and IPv6 addresses?

IPv4 uses 32-bit addresses formatted as four decimal numbers separated by periods (e.g. 192.0.2.1), supporting approximately 4.3 billion unique devices. IPv6 uses 128-bit addresses represented in eight groups of hexadecimal digits (e.g. 2001:0db8::8a2e:0370:7334), providing virtually unlimited address space to accommodate modern internet growth.

How accurate is geographic IP lookup?

IP geolocation is generally 95% to 99% accurate at the country level, and roughly 60% to 80% accurate at the state, province, or city level. Accuracy depends on ISP routing tables, mobile carrier gateways, and proxy networks. It never reveals an exact physical street address.

Can someone find my personal identity from my IP address?

No. An IP address only identifies a network connection or internet service provider. Only your ISP possesses subscriber records linking an IP assignment to a billing address, and ISPs only disclose that information pursuant to a valid legal warrant.

What information is shown for an IP?

The lookup returns geolocation (city, region, country), ISP/organization, autonomous system number (ASN), timezone, and whether the IP is from a VPN, proxy, or Tor node.

How accurate is IP geolocation?

City-level accuracy is typically 50–80%. Country-level accuracy is over 99% for most IPs. VPNs and proxies can skew results.

Can I look up my own IP?

Yes. Leave the input blank or click 'My IP' to look up your current public IP address.

What data sources are used?

This tool queries the ipapi.co geolocation API, which aggregates data from multiple regional internet registries (RIRs).