Network
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My IP — public address and location
Your public IP, ISP, AS and approximate location.
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Network tools platform
All your network tools.
All your network tools.
In one place.
Calculate, verify, convert and diagnose your network infrastructure right from your browser.
Popular tools
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The most-used tools among network technology students, system administrators and network technicians.
Network
IPv4 / CIDR Calculator
Address, mask, network, broadcast, host range and binary.
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Network
Subnet Calculator
Split a network into fixed-size subnets.
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Conversion
IPv4 to Binary
Byte-by-byte conversion to 32 bits.
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Network
VLAN Calculator
Complete per-VLAN addressing plan with gateways.
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DNS
En ligne
DNS Lookup
Resolve A, AAAA, MX, TXT, NS, CNAME and more.
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HTTP / Web
En ligne
HTTP Headers Checker
Response headers and security header audit.
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Diagnostics
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Ping (Availability)
Test ICMP reachability of a public host.
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Conversion
Mbit/s to MB/s
ISP line speed to download speed.
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Linux
UFW Rule Generator
Safe UFW commands ready to verify.
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Linux
chmod Calculator
Octal and symbolic permissions in one click.
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Full catalog
All 48 tools, available right away
Every tool is one click away, with no sign-up or installation. Search by name or browse the categories.
Network
Conversion
DNS
HTTP / Web
Linux
Cisco
Why NetTools FR?
Tools designed for the field
Free
Essentials always free
All tools are free: network calculators, conversions and diagnostics, with no hidden quota or artificial limits.
Instant
No installation
Everything runs in your browser. No client to install, no account required to use the tools.
Fast
Lightweight pages
Server-side rendering, minimal JavaScript: the site stays comfortable even on an average 4G connection.
Mobile
Mobile friendly
Interfaces tested from 360 px up to large screens: the calculators remain thumb-friendly in the field.
Privacy
Privacy-friendly
Aggregated statistics without profiling, no data resale, no input stored for anonymous users.
Educational
Built for learning
Each tool explains the method, provides examples and cites its sources: ideal for CCNA or networking course revision.
Testimonials
They use NetTools FR every day
« I revised my entire addressing module with the VLSM calculator and the exercises. Much clearer than the course's Excel tables. »
Léa M.
Network technology student
« The SPF/DKIM/DMARC validator saved me half a day: I found in two minutes why a client's emails were going to spam. »
Karim B.
System administrator
« I prepare my Cisco labs with the VLAN generator and the addressing plan: students get consistent exercises in a few clicks. »
Sophie D.
Network instructor, vocational high school
Do you use NetTools FR? Write to us to share your experience.
Roadmap
What's coming soon
Online traceroute, multi-port scanner, global DNS propagation, subnetting quiz, public API: discover what's coming next.
View the full roadmap
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Support replies by email within 48 business hours. Security reports are handled as a priority.
Latest tutorials
Learn by doing
Short, practical guides with copy-ready commands and related tools.
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