Pick a tool.
🆔 What is My IP
Show your public IPv4 and IPv6 addresses with approximate location.
→🔍 DNS Lookup
Look up DNS records (A, AAAA, MX, TXT, NS, CNAME) for any domain.
→↩️ Reverse DNS Lookup
Find the hostname registered for any IP address (PTR record).
→🧮 Subnet / CIDR Calculator
Calculate network, broadcast, host range, mask from any CIDR notation.
→⏱️ Bandwidth / Download Time Calculator
How long does an X GB file take at Y Mbps? Real-world download time.
→🔄 Network Speed Unit Converter
Convert between bps, Kbps, Mbps, Gbps, Tbps, KBps, MBps, GBps.
→🔢 IPv4 ↔ Binary / Hex / Decimal
Convert IPv4 between dotted decimal, binary, hex, and integer.
→🏷️ IP Class Identifier
Identify class (A, B, C, D, E) of any IPv4 address. Private vs public.
→🔖 MAC Address Tool
Format, validate, and look up the manufacturer of any MAC address.
→📦 MTU / MSS Calculator
Compute MSS from MTU, account for IPsec/PPPoE/VLAN tunneling overhead.
→🔌 TCP / UDP Port Reference
Searchable reference of common TCP/UDP ports and the services that use them.
→🌐 HTTP Status Codes
Searchable reference of HTTP status codes (1xx, 2xx, 3xx, 4xx, 5xx).
→📚 DNS Record Types Reference
What each DNS record type does (A, AAAA, MX, TXT, CNAME, SRV, CAA, etc.).
→✨ Wake-on-LAN Magic Packet
Generate the Wake-on-LAN magic packet for any MAC address.
→📡 Latency-to-Distance Calculator
Convert ping latency to max possible distance. Bounded by speed of light.
→📐 IPv6 Expand / Compress
Expand shorthand IPv6 (2001:db8::1) to full form, or compress it back.
→🎯 CIDR Contains Check
Check if an IP address is inside a CIDR block.
→🔁 IP Range to CIDR
Convert an IP range (10.0.0.1 - 10.0.0.255) to the minimum set of CIDR blocks.
→🧩 CIDR Aggregator
Merge a list of CIDR blocks into the smallest equivalent set.
→📋 Netmask Cheatsheet
Lookup table: CIDR prefix to mask, wildcard, host count, common use.
→🚫 Reserved IPv4 Ranges
Reference of all RFC-reserved IPv4 ranges (private, loopback, link-local, etc.).
→📑 Networking RFC Reference
Important networking RFCs by number and topic.
→📡 ICMP Type / Code Reference
ICMP message types and codes (echo request, destination unreachable, etc.).
→🚩 TCP Flags Reference
TCP control flags (SYN, ACK, FIN, RST, PSH, URG, ECE, CWR).
→🥞 OSI vs TCP/IP Model
OSI seven-layer model vs TCP/IP four-layer model, side by side.
→📨 HTTP Headers Reference
Searchable reference of HTTP request and response headers.
→🔧 HTTP Methods Reference
GET, POST, PUT, DELETE, PATCH, OPTIONS, HEAD — when to use each.
→🍪 Cookie Parser
Parse and decode HTTP Cookie / Set-Cookie headers into key-value pairs.
→⏳ Cache-Control Builder
Build Cache-Control header values from common scenarios.
→🌍 CORS Headers Reference
CORS preflight, Access-Control-* headers, and common gotchas.
→✉️ SPF Record Builder
Build a valid SPF TXT record for your email domain.
→🛡️ DMARC Record Builder
Build a valid DMARC TXT record with reporting addresses.
→📧 Email DNS Check
Look up MX, SPF, DMARC records for a domain in one shot.
→🔒 TLS / SSL Versions Reference
SSL 2.0 through TLS 1.3 — release dates, deprecation status, key features.
→🔐 TLS Cipher Suites Reference
Common TLS cipher suites — what they mean and which are safe.
→Network tools the way
they should be.
Browser-only
Tools that can run in the browser do. The few that need an upstream lookup (DNS, IP geolocation) hit free public endpoints — Cloudflare and ipify — directly from your machine, not through us.
No data harvesting
We don't log your inputs. We don't resell your IP. The big network tool sites do — that's how they monetize. We do display ads on the homepage and call it done.
Direct answers
Every tool gives you the answer first, then explains. No "Here's a thrilling story about network protocols before we tell you your IP" content marketing.
One page per tool
Bookmarkable URLs. Shareable. Each tool loads in under a second. Try it.
Why NetToolset?
Most "free network tools" sites are content farms with login walls, banner ads in the tool itself, and inputs that get sent to an analytics broker before the result is even shown. We do it differently. The tools run in your browser. Public lookups (DNS, IP) hit Cloudflare directly. Nothing in between.