IPv4 Subnet Calculator
Calculate network, broadcast, usable range, mask, and wildcard from an IP + CIDR or subnet mask.
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IP & Subnetting
CIDR Calculator
Break down a CIDR block into its network details, plus a full CIDR reference table.
Open ToolVLSM Calculator
Allocate variable-length subnets from a base network to meet multiple host-count requirements.
Open ToolIP Range Calculator
Find the total address count and the CIDR blocks that cover a start-to-end IP range.
Open ToolWildcard Mask Calculator
Convert between subnet masks and wildcard masks for ACLs and OSPF configuration.
Open ToolIPv4 â Binary Converter
Convert an IPv4 address to its 32-bit binary form and back again, octet by octet.
Open ToolDNS & Domain
Network Diagnostics
Port Lookup
Look up well-known TCP/UDP ports by number or by service name.
Open ToolMAC / OUI Lookup
Normalize a MAC address, extract its OUI, and identify the manufacturer where known.
Open ToolPing / Latency
Run an HTTP-based latency test against a host and see min/avg/max response times.
Open ToolHTTP Status Checker
Check the live HTTP status code, response time, and redirect chain for any URL.
Open ToolHTTP Headers Checker
Inspect response headers, including key security headers like HSTS and CSP.
Open ToolSSL/TLS Checker
Verify that a domain establishes a working HTTPS connection.
Open ToolCalculators
Bandwidth Calculator
Estimate file transfer time from size and bandwidth, or work backward to required bandwidth.
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