免费工具
网络、Linux、Windows 与邮件工具
我为日常工作开发的计算器、配置生成器和检查器。免费、快速、私密——除需实时 DNS 查询外，全部在浏览器中运行。
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.
打开工具 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.
打开工具 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.
打开工具 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.
打开工具 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.
打开工具 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.
打开工具 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.
打开工具 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.
打开工具 NetworkIPv4 Subnet Calculator
Network, broadcast, usable host range, wildcard mask and binary view for any IPv4 address and CIDR prefix.
打开工具 NetworkIPv6 Subnet Calculator
Prefix range, number of addresses and /64 networks, and a list of subnets when you split a delegation.
打开工具 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.
打开工具 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.
打开工具 NetworkIPv6 Cheat Sheet
IPv6 address types, special prefixes and prefix sizes on one page – a quick reference for planning and troubleshooting.
打开工具 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.
打开工具 NetworkIPv4 Address Converter
Convert an IPv4 address to decimal, hex, binary, octal and its IPv4-mapped IPv6 form – and back.
打开工具 NetworkBandwidth & Transfer Time Calculator
How long will a backup, upload or migration take? Enter the size and link speed – with a realistic overhead allowance.
打开工具 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.
打开工具 Email & DNSDNS Lookup
Look up A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, SRV and PTR records for any domain or IP address.
打开工具 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.
打开工具 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.
打开工具 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.
打开工具 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.
打开工具 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.
打开工具 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.
打开工具 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.
打开工具 LinuxCrontab Generator
Build a cron schedule from plain choices, read any cron expression in plain English and preview the next run times.
打开工具 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.
打开工具 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.
打开工具 WindowsRobocopy Command Builder
Build a safe Robocopy command for migrations, mirrors and backups – multithreaded, with retries, logging and an optional dry run.
打开工具 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.
打开工具 SecurityPassword & Passphrase Generator
Strong random passwords and memorable passphrases generated with your browser’s cryptographic random source – nothing is sent or stored.
打开工具 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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