Tools Networking
Networking tools
Inspect DNS, calculate networks and subnets, and work with IP-level developer data.
Networking tools
networking
Local
CIDR Calculator
Calculate IPv4 network, broadcast, mask, and usable address ranges locally.
networking
Local
SPF & DMARC Record Explainer
Explain an SPF or DMARC record term by term and flag what will not work.
networking
Local
MAC Address Tool
Convert MAC notations, read the assignment bits, and derive the EUI-64 and link-local address.
networking
Local
Well-Known Ports Reference
Search common TCP and UDP ports, what listens there, and the ones they are confused with.
networking
Local
Subnet Planner
Divide a block into subnets by host count, around the allocations you already have.
networking
Local
IPv6 Address Tool
Expand, compress, and inspect IPv6 addresses, prefixes, and reverse DNS names.
networking
Local
IP Range to CIDR Converter
Convert address ranges to CIDR blocks and back, aggregate blocks, and find overlaps.