Professional-grade IP address tools for network engineers, developers, and IT professionals. Calculate subnets, trace routes, lookup locations, scan ports — all free, no registration.
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Calculate network address, broadcast, host range, wildcard mask from CIDR.
Open Calculator IPv4Convert subnet masks to wildcard masks for ACL configuration.
Calculate Wildcard IPv4Convert IP address ranges to minimal CIDR notation blocks.
Convert Range IPv4Plan VLSM subnetting by specifying host counts.
Plan Subnets IPv4Check overlap and containment between two subnets.
Compare IPv6Expand, compress, and calculate IPv6 prefixes.
Calculate IPv6 IPv6Convert IPv6 ranges into minimal CIDR notation.
Convert IPv6Compare two IPv6 prefixes for overlap.
Compare IPv6Convert between IPv4 and IPv6 formats.
Convert NetworkFind geographic location, ISP for any IP.
Lookup NetworkDiscover network owner and routing policies.
Lookup ASN NetworkTest connectivity and measure latency.
Run Ping NetworkMap hop-by-hop network path.
Trace Route NetworkScan for open services and ports.
Scan Ports NetworkDetect VPN, proxy, or Tor exit nodes.
Check NetworkScore IP risk across threat sources.
Check ToolsResolve domains to IP addresses.
Resolve ToolsDiscover your public IP address.
Check ToolsQuery IP/domain registration data.
Lookup ToolsCheck IP against spam blacklists.
Check ToolsIdentify vendor from MAC address.
Lookup ToolsReview announced prefixes and peers.
Lookup ToolsCondense blocks into supernets.
Merge ToolsDetect conflicting address blocks.
Check ToolsExpand CIDR to IP addresses.
ExpandThis directory brings together calculation pages, registry lookups, routing visibility checks, and active diagnostics. The goal is to make common IP and network tasks easier to discover, easier to understand, and easier for search engines and AI assistants to summarize accurately. The existing cards and navigation remain unchanged, but the extra guidance explains how the tools relate to one another and what kind of output each class of page produces.
Use the IPv4, IPv6, range, wildcard, and overlap tools when you need exact address math, network boundaries, route summaries, or conflict checks.
Use WHOIS, RDAP, ASN, and BGP pages when you need to understand who a block belongs to and how it appears in public routing context.
Use location, reputation, blacklist, ping, traceroute, and port checks for investigation and troubleshooting, while remembering that many of these results depend on external sources and probe position.
These tools combine deterministic subnet calculations with data driven lookup workflows. Use the right page for the question you are answering, and treat results according to the kind of evidence they represent.
The collection includes IPv4 and IPv6 calculators, CIDR and range tools, WHOIS and ASN lookups, BGP visibility tools, geolocation, reputation, blacklist, ping, traceroute, and port checks.
Subnetting and notation tools are primarily calculation based, while WHOIS, BGP, geolocation, reputation, blacklist, and active network checks depend on external data or probe context.
IP geolocation is approximate, WHOIS and RDAP depend on registry freshness, reputation and blacklist signals vary by source, and live probes depend on the network path and filtering.
Use IPv4 and IPv6 calculators for subnet math, range and CIDR tools for notation conversion, WHOIS and ASN tools for ownership, BGP for routing visibility, and diagnostics for live network behavior.
Yes. They are designed to support troubleshooting, planning, investigations, and documentation, but important decisions should still be verified with authoritative sources and environment specific evidence.
Outputs are informational. Data driven pages depend on source freshness, and active tests such as ping, traceroute, and port checks can be affected by firewalls, routing policy, NAT, and rate limits.
IPv4, IPv6, CIDR, BGP, RDAP, ICMP, and related networking standards published through the IETF RFC series.
Authoritative registries for address space, AS numbers, special-purpose assignments, and service names.
ARIN, RIPE NCC, APNIC, AFRINIC, and LACNIC for allocation and registration context.
Nmap documentation for port testing context and Schema.org guidance for structured data markup.
Start with IPv4 subnet calculation, range conversion, wildcard masks, and overlap checks.
Move into IPv6 prefix calculation, range conversion, and IPv6 specific comparison workflows.
Use WHOIS, ASN, and BGP tools when you need registry and routing context.
Use ping, traceroute, port, blacklist, and reputation checks for active troubleshooting and risk review.