Herramientas gratuitas
Herramientas de red, Linux, Windows y correo
Calculadoras, generadores de configuración y comprobadores que creé para mi propio trabajo. Gratis, rápidos y privados – todo se ejecuta en su navegador salvo las consultas DNS en vivo.
Ping Test
Ping any website or public IP from our server: reply times, packet loss, jitter and TTL for each packet – check whether a host is up and how healthy the path is.
Abrir herramienta Network troubleshootingTraceroute (MTR)
See every router between our server and a destination, with packet loss and latency per hop (MTR report) – find where a connection slows down or breaks.
Abrir herramienta Network troubleshootingOpen Port Checker
Check from the internet whether ports are open, closed or filtered on a server or router – port forwarding, firewalls, mail, RDP, SSH and VPN in one test.
Abrir herramienta Network troubleshootingWebsite Down? HTTP Status & Speed Checker
Is a website down for everyone or just you? See the HTTP status, every redirect, DNS/connect/TLS/first-byte timings and the security and caching headers.
Abrir herramienta Network troubleshootingSSL Certificate Checker
Check a site’s HTTPS certificate: is it trusted, does it match the name, when does it expire, who issued it, and which TLS version and cipher the server uses.
Abrir herramienta Network troubleshootingWhat Is My IP Address?
Your public IP address, whether it’s IPv4 or IPv6, its reverse DNS name and your browser’s network details – everything support asks for, ready to copy.
Abrir herramienta Network troubleshootingDNS Propagation Checker
Has your DNS change reached the world yet? Compare the answer from the domain’s own nameservers with Google, Cloudflare, Quad9, OpenDNS and other public resolvers.
Abrir herramienta Network troubleshootingWHOIS & Domain Expiry Lookup
Who is the registrar, when was the domain registered, when does it expire, which nameservers does it use and is it locked? Full WHOIS record included.
Abrir herramienta NetworkIPv4 Subnet Calculator
Network, broadcast, usable host range, wildcard mask and binary view for any IPv4 address and CIDR prefix.
Abrir herramienta NetworkIPv6 Subnet Calculator
Prefix range, number of addresses and /64 networks, and a list of subnets when you split a delegation.
Abrir herramienta NetworkIPv6 Address Converter
Expand or compress any IPv6 address and see it as binary, decimal, hex groups and an ip6.arpa reverse DNS name – or turn a decimal number back into IPv6.
Abrir herramienta NetworkIPv6 Address Validator
Check whether an IPv6 address is valid and find out what kind it is – global unicast, link-local, unique local, multicast, documentation, IPv4-mapped and more.
Abrir herramienta NetworkIPv6 Cheat Sheet
IPv6 address types, special prefixes and prefix sizes on one page – a quick reference for planning and troubleshooting.
Abrir herramienta NetworkMAC Address Converter
Reformat a MAC address for Windows, Linux or Cisco, check its unicast/multicast and local/global bits, and derive the EUI-64 IPv6 link-local address.
Abrir herramienta NetworkIPv4 Address Converter
Convert an IPv4 address to decimal, hex, binary, octal and its IPv4-mapped IPv6 form – and back.
Abrir herramienta NetworkBandwidth & Transfer Time Calculator
How long will a backup, upload or migration take? Enter the size and link speed – with a realistic overhead allowance.
Abrir herramienta NetworkTCP/UDP Port Lookup
Search the well-known ports used by mail, web, remote access, databases, Windows domains and VoIP – with protocol and firewall notes.
Abrir herramienta Email & DNSDNS Lookup
Look up A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, SRV and PTR records for any domain or IP address.
Abrir herramienta Email & DNSSPF, DKIM & DMARC Checker
Check a domain’s MX, SPF, DMARC and DKIM records in one go, with plain-English findings and fixes for common mistakes.
Abrir herramienta Email & DNSSPF Record Generator
Build a valid SPF TXT record for Microsoft 365, Google Workspace, your own mail server and sending services – with a lookup counter.
Abrir herramienta Email & DNSDMARC Record Generator
Create a DMARC policy record step by step – from monitoring (p=none) to full protection (p=reject) – with reporting addresses and alignment.
Abrir herramienta Email & DNSDKIM Record Generator
Generate a DKIM key pair in your browser and get the DNS TXT record, the private key and ready-to-use OpenDKIM settings – or turn an existing public key into a record.
Abrir herramienta LinuxNetplan YAML Generator
Generate a correct Netplan file for a static IP or DHCP on Ubuntu 18.04 to 26.04 – with the right gateway syntax, file permissions and apply commands.
Abrir herramienta LinuxNginx Server Block Generator
Production-ready Nginx server blocks for WordPress/PHP-FPM, static sites and reverse proxies – HTTPS, HTTP/2, www redirect and security headers included.
Abrir herramienta Linuxsystemd Service Generator
Turn any script or app into a systemd service that starts on boot, restarts on failure and runs as a locked-down user.
Abrir herramienta LinuxCrontab Generator
Build a cron schedule from plain choices, read any cron expression in plain English and preview the next run times.
Abrir herramienta Linuxchmod Calculator
Tick read, write and execute for owner, group and others – or type an octal like 750 – and get the symbolic form and the command.
Abrir herramienta WindowsWindows Static IP Command Generator
Set a static IP, gateway and DNS on Windows 10/11 or Windows Server – as netsh or PowerShell commands, plus the commands to switch back to DHCP.
Abrir herramienta WindowsRobocopy Command Builder
Build a safe Robocopy command for migrations, mirrors and backups – multithreaded, with retries, logging and an optional dry run.
Abrir herramienta WindowsWindows Repair Command Generator
Pick the problem – corrupt system files, update failures, network trouble, disk errors – and get the right SFC, DISM, chkdsk or netsh sequence in the right order.
Abrir herramienta SecurityPassword & Passphrase Generator
Strong random passwords and memorable passphrases generated with your browser’s cryptographic random source – nothing is sent or stored.
Abrir herramienta SecurityHash & Checksum Generator
SHA-256, SHA-512 and SHA-1 for text or files – verify an ISO or installer against its published checksum without uploading it anywhere.
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