Complete IP & Network Tools
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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IPv4 Subnet Calculator
Calculate network address, broadcast, host range, wildcard mask from CIDR.
Open Calculator IPv4Wildcard Mask Calculator
Convert subnet masks to wildcard masks for ACL configuration.
Calculate Wildcard IPv4IP Range to CIDR
Convert IP address ranges to minimal CIDR notation blocks.
Convert Range IPv4Multiple Subnets
Plan VLSM subnetting by specifying host counts.
Plan Subnets IPv4Compare Subnets
Check overlap and containment between two subnets.
Compare IPv6IPv6 Calculator
Expand, compress, and calculate IPv6 prefixes.
Calculate IPv6 IPv6IPv6 Range to CIDR
Convert IPv6 ranges into minimal CIDR notation.
Convert IPv6IPv6 Compare
Compare two IPv6 prefixes for overlap.
Compare IPv6IPv4 ↔ IPv6
Convert between IPv4 and IPv6 formats.
Convert NetworkIP Location Lookup
Find geographic location, ISP for any IP.
Lookup NetworkASN Lookup
Discover network owner and routing policies.
Lookup ASN NetworkPing Test
Test connectivity and measure latency.
Run Ping NetworkTraceroute
Map hop-by-hop network path.
Trace Route NetworkPort Scanner
Scan for open services and ports.
Scan Ports NetworkVPN/Proxy Checker
Detect VPN, proxy, or Tor exit nodes.
Check NetworkIP Reputation
Score IP risk across threat sources.
Check ToolsURL to IP
Resolve domains to IP addresses.
Resolve ToolsWhat is My IP
Discover your public IP address.
Check ToolsWHOIS Lookup
Query IP/domain registration data.
Lookup ToolsBlacklist Checker
Check IP against spam blacklists.
Check ToolsMAC OUI Lookup
Identify vendor from MAC address.
Lookup ToolsBGP Prefix Lookup
Review announced prefixes and peers.
Lookup ToolsCIDR Merge
Condense blocks into supernets.
Merge ToolsCIDR Overlap
Detect conflicting address blocks.
Check ToolsCIDR to IP List
Expand CIDR to IP addresses.
ExpandWhat this collection does
This page groups related IP networking tools so visitors can choose the right calculator or converter without guessing from a filename alone. The links, summaries, and supporting notes explain what each page is for and what kind of input it expects.
How to use this collection
- Start with the tool that matches the measurement, tax topic, network task, or text operation you need.
- Open the matching page and check the input labels, examples, and assumptions before entering data.
- Use the result as a practical calculation aid, then verify high-impact work against official rules, source records, or domain references.
How To Use This Tool Collection
This 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 readers and crawlers 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.
Subnet and CIDR tools
Use the IPv4, IPv6, range, wildcard, and overlap tools when you need exact address math, network boundaries, route summaries, or conflict checks.
Ownership and routing tools
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.
Diagnostics and risk tools
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.
Frequently Asked Questions
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.
What kinds of tools are included here?
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.
Are the calculation tools local or data driven?
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.
Which results should be treated as approximate?
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.
How should I choose the right tool?
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.
Can these pages support incident response and operations?
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.
What limitations apply across the site?
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.
Sources & References
IETF core references
IPv4, IPv6, CIDR, BGP, RDAP, ICMP, and related networking standards published through the IETF RFC series.
IANA registries
Authoritative registries for address space, AS numbers, special-purpose assignments, and service names.
Regional registries
ARIN, RIPE NCC, APNIC, AFRINIC, and LACNIC for allocation and registration context.
Operational references
Nmap documentation for port testing context and Schema.org guidance for structured data markup.
Related Tool Paths
IPv4 and subnetting
Start with IPv4 subnet calculation, range conversion, wildcard masks, and overlap checks.
IPv6 planning
Move into IPv6 prefix calculation, range conversion, and IPv6 specific comparison workflows.
Ownership and routing
Use WHOIS, ASN, and BGP tools when you need registry and routing context.
Diagnostics and reputation
Use ping, traceroute, port, blacklist, and reputation checks for active troubleshooting and risk review.
What these network tools do
The IP and network tools cover subnet math, CIDR conversion, overlap checks, ASN and BGP lookups, WHOIS/RDAP context, geolocation, blacklist checks, ping, traceroute, and port testing. Calculation tools are deterministic, while lookup and diagnostic tools depend on registry data, public routing views, and live network conditions.
IPv6 Calculator and Prefix Notes
An ipv6 calculator works with 128-bit addresses written as eight groups of four hexadecimal digits. Use the ipv6 prefix calculator for ranges such as /64, /56, or /48, and use an ipv4 to ipv6 converter or convert 6to4 ipv6 note when you are documenting transition addresses. Searches like ipv6 calculator with ranges, ipv6 first available address calculator, ipv6 update calculator, and ipv6-calculator.com all point to the same basic need: understand the prefix and the usable range.
CIDR Calculator From Range to CIDR
Use range to cidr, batch ip ranges to cidr, bulk ip list into cidr, and cidr overlap check when you are cleaning firewall rules or summarizing IP inventory. A CIDR block is valid only when the start address and block size line up exactly.
| CIDR | Mask | IPv4 addresses |
|---|---|---|
| /8 | 255.0.0.0 | 16,777,216 |
| /16 | 255.255.0.0 | 65,536 |
| /24 | 255.255.255.0 | 256 |
| /30 | 255.255.255.252 | 4 |
| /32 | 255.255.255.255 | 1 |
For url to ipv4, resolve the hostname first, then place the returned A record into the subnet or CIDR tool.