Networking & IT Tools
Subnet calculators, IP tools, and lookup references for everyday networking and sysadmin tasks.
- Subnet Calculator
Calculate network address, broadcast address, and host range from an IP and CIDR prefix. Free, instant.
- IP Validator
Check if an IP address is valid IPv4 or IPv6, and see its type. Free, instant.
- MAC Generator
Generate random, locally-administered MAC addresses for testing. Free, instant.
- CIDR to Subnet Mask
Convert between CIDR notation and dotted-decimal subnet masks. Free, instant.
- Port Lookup
Look up common well-known port numbers and their services. Free, instant.
- Binary IP Converter
Convert an IPv4 address between decimal and binary notation. Free, instant.
- Wildcard Mask Calculator
Calculate the wildcard mask (inverse subnet mask) from a CIDR prefix. Free, instant.
- Download Time Calculator
Estimate download or transfer time from file size and connection speed. Free, instant.
- IPv6 Compress/Expand
Convert an IPv6 address between compressed (::) and fully expanded form. Free, instant.
- Subnetting Planner
Split a network into equal-sized subnets for VLSM planning. Free, instant.
- MTU Overhead
Calculate effective payload MTU after tunnel/VPN encapsulation overhead. Free, instant.
- DNS Record Types
Look up what each DNS record type (A, MX, TXT, CNAME, and more) is used for. Free, instant.
- MAC Vendor Lookup
Look up the manufacturer of a device from its MAC address's OUI prefix. Free, instant.
- Latency & Distance
Calculate theoretical minimum ping latency for a distance, or maximum distance for a ping time. Free, instant.
- Jitter Calculator
Calculate average, min, max, and jitter from a set of ping/RTT samples. Free, instant.
- Wi-Fi Channel Overlap
Check if two 2.4GHz Wi-Fi channels overlap with each other. Free, instant.
- MAC Format Converter
Convert a MAC address between colon, dash, dot, and no-separator notations. Free, instant.
- DNS TTL Calculator
Convert a DNS record's TTL in seconds into a human-readable duration. Free, instant.
- VLAN ID Validator
Check whether a VLAN ID is valid, reserved, or in the extended range. Free, instant.
- IP Class Identifier
Identify the classful network class (A, B, C, D, or E) of an IPv4 address. Free, instant.
- dBm to Percent
Convert a Wi-Fi signal strength reading in dBm to an approximate percentage. Free, instant.
- Uptime SLA Calculator
Convert an uptime SLA percentage into allowed downtime per year, month, week, and day. Free, instant.
- Packet Loss %
Calculate the packet loss percentage from packets sent and received. Free, instant.
- Cable Category Lookup
Look up max speed and distance for Cat5 through Cat8 Ethernet cable categories. Free, instant.