IP Address & Network Tools

IP tools are web-based utilities that operate on the Internet Protocol — IPv4 (RFC 791) and IPv6 (RFC 8200). The 34 tools in this collection cover five functions: geolocation and WHOIS registration lookup, network diagnostics (ping, traceroute, port testing), subnet calculation and CIDR conversion, blacklist and reputation checking, and IPv6 address manipulation. All tools execute server-side, query live data from ARIN, RIPE NCC, APNIC, and public DNS resolvers, and return results in real time.

Most used

IP Blacklist Checker Is my mail server listed? Port Checker Is my port open? Subnet Calculator How big is my subnet? My Location Where am I?

Your connection

What the internet sees when you connect5 tools

What Is My IP Address?

Reveal your public IPv4 and IPv6 address, ISP, ASN, and approximate geolocation — detected automatically on page load.

My Location

Instantly see your IP-based city, country, and ISP — then pinpoint your exact GPS coordinates with one click.

What Is My Internet Service Provider (ISP)?

Detects your Internet Service Provider and Autonomous System Number (ASN) from your current public IP address — results appear on page load.

Proxy Checker

Three checks on your connection: proxy headers, Tor exit list and datacenter / VPN networks.

Internet Speed Test

Measure your broadband download speed, upload speed, ping latency, and jitter from the nearest test server.

Look up an IP or domain

Owner, network, location and reputation of any address8 tools

IP Lookup

Returns country, city, region, ISP, ASN, hostname, and coordinates for any IPv4 or IPv6 address.

IP Whois Lookup

Find the registered owner, network block, CIDR range, country, and abuse contact for any IPv4 or IPv6 address.

IP Blacklist Checker

Check any IPv4 or IPv6 address against 18 public DNS-based blocklists for spam, botnet, and abuse listings.

IP to ASN Lookup

Find the Autonomous System Number (ASN) and registered network operator for any IPv4 or IPv6 address.

ASN WHOIS Lookup

Retrieve the registered owner, network name, org handle, and address for any Autonomous System Number via live RDAP and WHOIS data.

Domain to IP

Find the IPv4 and IPv6 addresses of any website or domain via live DNS resolution.

IP to Domain / Reverse IP Lookup

Perform a PTR record lookup to find the hostname registered to any IPv4 or IPv6 address — used to verify reverse DNS configuration for mail servers.

Domain WHOIS Lookup

Look up the registered owner, registrar, nameservers, and expiry date for any domain name.

Test reachability

From our server to your host4 tools

Ping

Send 5 ICMP echo requests to any IPv4 address, IPv6 address, or hostname and see real-time RTT, packet loss, and latency statistics.

Traceroute

Trace the network path to any IPv4 address, IPv6 address, or hostname — hop by hop, streamed live.

Port Checker

Tests whether a specific TCP port on any hostname or IP address is open and accepting connections from the public internet.

Website IPV6 Support Test

Queries AAAA DNS records from authoritative name servers to verify whether a website or domain is reachable over IPv6.

Subnets & CIDR

Plan and check address ranges4 tools

IP Subnet Calculator & Visualizer / CIDR Calculator

Interactive CIDR tool with live binary bit-mapping — calculates network address, broadcast, host range, usable hosts, and subnet mask for any IPv4 prefix.

IPv6 Subnet Calculator & Planner

128-bit prefix planning with RFC 5952 canonical compression — calculates network prefix, total address count, and range boundaries for any IPv6 prefix length.

IP Range to CIDR Converter (IPv4/IPv6)

Convert a start and end IP address into the minimal set of CIDR blocks for any IPv4 or IPv6 range.

Is IP Address In CIDR Range?

Enter any IPv4 or IPv6 address and a CIDR block to check whether the IP belongs to the subnet — result is instant.

Convert & format

Change how an address is written7 tools

IPv4 to IPv6

Get the IPv4-mapped IPv6 representation for any IPv4 address — ::ffff: notation per RFC 4291, single or bulk mode.

IPv6 to IPv4

Extract the embedded IPv4 address from any IPv4-mapped IPv6 (::ffff:) address — hex or dotted-decimal notation, single or bulk.

IP to Decimal

Convert any IPv4 or IPv6 address to its 32-bit or 128-bit decimal integer representation — single address or bulk list with copy-all output.

IP to Binary

Convert any IPv4 address to four 8-bit binary octets or any IPv6 address to sixteen 8-bit groups — used for subnet mask and routing analysis.

IP to Hex

Convert any IPv4 or IPv6 address to its hexadecimal representation — the format used in network protocol headers and hardware configuration.

IPv6 Compression Tool

Shorten any full IPv6 address to its RFC 5952 canonical form — leading zeros removed, longest zero run replaced with ::. Single address or bulk list.

IPv6 Expand Tool

Expands any compressed IPv6 address to the full RFC 4291 §2.2 notation — eight groups of four lowercase hex digits, all leading zeros restored.

Check & clean lists

Validate, classify, extract, sort6 tools

IP Validator

Validate IPv4 and IPv6 addresses for syntax, version, and address class — single address or bulk list with Copy Valid filter.

Is This a Public or Private IP?

Determine whether an IPv4 or IPv6 address is publicly routable or falls within a private range — RFC 1918 for IPv4, RFC 4193 for IPv6 ULAs.

IP Class Checker

Identify the classful network class (A, B, C, D, or E) and default subnet mask for any IPv4 address per the original RFC 791 addressing scheme.

IP Extractor

Scans any block of text or log output and extracts all valid IPv4 and IPv6 addresses — useful for parsing server logs, email headers, and firewall rule sets.

IP Sorter

Sort a list of IPv4 or IPv6 addresses numerically in ascending or descending order — paste a list, select order, copy or download the sorted result.

Random IP Generator

Generate random public IPv4 or IPv6 addresses for firewall rule testing, network simulation, and configuration validation — bulk output supported.

Common IP Tool Workflows

IP tools are most effective when used in sequence. The table below maps the five most common investigation and diagnostic workflows, with each tool linked directly.

Workflow	Tool Sequence	Purpose
IP Investigation	IP Lookup → IP WHOIS → IP to ASN → ASN WHOIS → Reverse DNS	Trace the registered owner, network block, ASN, and hostname behind any IP address
Blacklist & Deliverability	IP Blacklist → IP WHOIS → Reverse DNS	Check spam and botnet listings, find the abuse contact, verify the PTR record
Network Diagnostics	Ping → Port Checker → Traceroute	Measure round-trip latency, test port reachability, and map the network path hop by hop
Subnet Planning	Subnet Calculator → IP CIDR Checker → IP Range to CIDR	Design, validate, and convert IPv4/IPv6 CIDR allocations for network planning
Proxy & Privacy Audit	Proxy Checker → IP Lookup → IP Blacklist	Detect masked connections, geolocate the exit IP, and check its threat status

What IP Tools Cover

Lookup and registration tools query live data from authoritative sources. IP Lookup uses commercial geolocation databases to return the approximate country, city, ISP, and ASN for any address. IP WHOIS Lookup queries the five Regional Internet Registries — ARIN, RIPE NCC, APNIC, LACNIC, and AFRINIC — via RDAP (RFC 7480) with a port-43 fallback (RFC 3912), returning the organization, network block, and abuse contact registered to an IP. IP to ASN Lookup resolves any address to its Autonomous System Number via the Cymru Team Whois service, and ASN WHOIS Lookup retrieves the full registration record for that ASN.

Network diagnostic tools send live probes from an external server. Ping sends five ICMP echo requests (RFC 792) and returns round-trip time, packet loss, and latency statistics. Traceroute maps each hop between the probe server and the target, with per-hop RTT. Port Checker opens a TCP socket (RFC 793) to any specified port on any public IPv4 or IPv6 address, returning open or closed status from a neutral external source — eliminating local firewall and NAT variables.

Calculation and conversion tools perform arithmetic on IP addresses without sending any network probes. The Subnet Calculator resolves any IPv4 CIDR block into its network address, broadcast address, usable host range, and subnet mask. The IPv6 Subnet Calculator handles 128-bit prefixes per RFC 5952. IP Range to CIDR converts a start and end address into the minimal covering set of CIDR blocks. Conversion tools — IP to Decimal, IP to Binary, IP to Hex — apply bitwise transformations to any address, supporting subnet mask analysis and packet-level debugging.

Frequently Asked Questions

What are IP tools used for?

IP tools query, analyze, and convert data about IPv4 and IPv6 addresses. Network administrators use lookup tools to identify the registered owner of an IP block, diagnose connectivity with ping and traceroute, verify port reachability, and check blacklist status. Developers use subnet calculators and CIDR converters for network planning. Security teams use IP WHOIS and blacklist tools to trace spam sources and evaluate IP reputation.

How accurate is IP geolocation?

IP geolocation is approximately 99% accurate at the country level. At the city level, accuracy drops to roughly 50–75%, depending on how granularly the ISP allocates address blocks across a region. Accuracy is lower for mobile networks and VPN exit nodes, where the IP is registered to the carrier or VPN provider rather than the end user's physical location. For street-level precision, GPS or browser geolocation is required.

What is the difference between an IP lookup and an IP WHOIS lookup?

IP Lookup (geolocation) returns the approximate country, city, region, ISP, and coordinates for an IP address, drawn from commercial geolocation databases — it answers where is this IP approximately located? IP WHOIS Lookup queries the Regional Internet Registry (RIR) — ARIN, RIPE NCC, APNIC, LACNIC, or AFRINIC — via RDAP (RFC 7480) or legacy WHOIS (RFC 3912) to return the organization, network block, and abuse contact registered to that address — it answers who owns this IP block? Both tools return different data from different sources and are complementary.

Do you store the IP addresses queried through these tools?

No. All queries are processed in real time and no IP addresses entered into any tool are stored, logged, or shared. Results are not cached on the server between sessions. Each request is treated as a fresh, stateless lookup — the queried address is used only to fetch the result and is discarded immediately after the response is returned.

Why might an IP tool return no result or an error?

Common causes: (1) Private IP ranges — RFC 1918 addresses such as 10.x.x.x, 172.16–31.x.x, and 192.168.x.x — have no public WHOIS or geolocation record; use the Is Public or Private IP tool first to confirm the address type. (2) A firewall may block ICMP or TCP probes — a ping returning no response does not confirm the host is offline. (3) Some domains have no PTR record configured — a reverse DNS lookup will return NXDOMAIN if the hosting provider has not set a PTR entry for that IP.