Calculate CIDR networks, masks, broadcasts and host ranges
Network Ops Collection
Network & DevOps Tools Hub
IP, CIDR, MAC, ports, User-Agent, URL and HTTP status utilities for everyday diagnostics.
A practical network toolkit for sysadmins, backend engineers, QA and DevOps teams. Calculate IPv4 subnets, expand IP ranges, convert IPv4 formats, generate IPv6 ULA addresses, create or look up MAC addresses, generate random ports, parse User-Agent strings, inspect URLs and reference HTTP status codes.
12Curated tools
3Workflows
3FAQ answers
Built for these intents
Expand IP ranges into address lists
Generate MAC addresses or look up OUI vendors
Parse browser User-Agent strings, URLs and HTTP status codes
Tools in this hub
IPv4 Subnet Calculator
CIDR calculator showing network, broadcast, host range, mask and wildcard for any prefix from /0 to /32, essential for network planning and firewalls.
IPv4 Range Expander
Expand CIDR notation to a full list of individual IP addresses with bulk export for firewall rules, network scans and access control setups.
IPv4 Address Converter
Convert IPv4 between dotted, decimal, hex and binary formats with reverse DNS for network debugging, protocol analysis and subnet calculations.
IPv6 ULA Generator
Generate IPv6 unique local addresses in the fd00::/8 range with custom subnet and EUI-64, for homelabs and private networks.
MAC Address Generator
Bulk-generate spec-compliant random MAC addresses with vendor OUI prefix and colon, hyphen or dot separators. Runs locally, no signup.
MAC Address Vendor Lookup
Look up the vendor, country and organization behind any MAC address by OUI prefix using the IEEE registry. Bulk lookup, runs locally, no upload.
Random Port Generator
Pick valid non-system ports in one click with bulk export, dedupe and range filtering. Free random port generator, no signup, runs in your browser.
User-Agent Parser
Parse User-Agent strings into browser, OS and device info with Chrome, Firefox and Safari detection for analytics and compatibility debugging.
URL Parser
Parse a URL into protocol, host, path, query, hash components with query parsing. Break links apart for redirects, analytics and quick debugging.
HTTP Status Codes
Reference for HTTP status codes (1xx-5xx) with meanings, examples and use cases. Debug API responses faster by looking up 404, 503 and every code.
Device Information
Display browser, OS, screen, GPU and runtime info with viewport, pixel ratio and more. Debug responsive layouts and feature detection on the fly.
Phone Parser & Formatter
Parse, validate and format international phone numbers into E.164 with country codes for contact forms, CRM imports and data cleanup workflows.
Suggested workflows
Subnet planning
Calculate a subnet, expand the range and convert IP address formats.
Device diagnostics
Generate or inspect MAC addresses, then pair device info with User-Agent parsing.
API troubleshooting
Parse URL parts, check HTTP status codes and reserve usable ports.
How to use this network hub
One place for related diagnostics
IP, ports, URLs, status codes and client details often appear in the same troubleshooting session.
Quick calculations without setup
Get subnet ranges, address conversions and text parsing without installing command-line utilities.
Useful in restricted environments
Local processing keeps core calculations and parsing available even when network access is limited.
Network tools FAQ
When should I use the IPv4 subnet calculator?
Use it for network planning, checking usable host ranges, validating masks and finding broadcast addresses.
Does MAC vendor lookup require internet access?
If OUI data is bundled, lookup can run locally. Coverage depends on the included dataset version.
Are User-Agent parsing results always accurate?
No. User-Agent strings can be spoofed, so parsed results are helpful signals but not security guarantees.