Networking
Calculate subnets and CIDR ranges, split networks, convert IP addresses and look up ports and HTTP status codes. Everything runs in your browser.
11 tools
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IP & subnetting
Subnets, CIDR ranges and address formats.
- Subnet calculatorCalculate the network address, broadcast, netmask and host count of an IPv4 subnet. Works with CIDR (/24) and netmask notation.Tool
- IP address converter (IPv4 & IPv6)Convert IPv4 to decimal, hex and binary, and expand or shorten IPv6 addresses. Also accepts plain numbers.Tool
- IP range to CIDR & IP in network checkConvert an IPv4 range to the minimal list of CIDR blocks and check whether an IP address belongs to a network.Tool
- Subnet splitter (VLSM)Divide an IPv4 network into smaller equal subnets and list each network, host range, broadcast and host count.Tool
Ports, protocols & bandwidth
Common ports, MAC addresses and transfer times.
- Data size & transfer time calculatorConvert bytes, KB, MB, GB and TB (decimal and binary) and calculate how long a transfer takes at a given speed.Tool
- Common network portsSearchable list of well-known TCP and UDP ports: SSH, HTTP, HTTPS, RDP, SMB, DNS, databases and more.Reference
- MAC address formatterConvert MAC addresses between colon, hyphen, Cisco dot and plain formats, check unicast or multicast and generate a random MAC.Tool
- MAC vendor lookupFind the manufacturer of a network device from its MAC address (OUI), and check whether an address is locally administered.NewTool
Web & HTTP
Status codes and URLs.
DNS
Look up DNS records for any domain.
Nothing of this type here yet.
Firewalls & ACLs Soon
Planned: rule mapper, comparator, converter and overlap detector.
Becomes a section once it has at least 3 tools.
Routing & topology Soon
Planned: route summarization and routing table simulator.
Becomes a section once it has at least 3 tools.