24款免费在线网络工具
FileCrank 提供24款面向网络工程师、系统管理员和开发者的免费网络工具，无需安装软件，直接在浏览器中使用。支持CIDR子网计算、DNS记录查询、公网IP检测、网络速度单位换算、端口号查询以及HTTP状态码参考。所有计算类工具在本地浏览器端运行，您的数据不会离开您的设备。
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所有Networking Tools（25）
My IP Address
Detect and display your public IP address, version, type, and class
IPv4 to IPv6 Converter
Convert an IPv4 address to its IPv6-mapped and 6to4 representations
IPv6 to IPv4 Converter
Extract the embedded IPv4 address from an IPv6-mapped or 6to4 address
CIDR Range Expander
Expand a CIDR notation into the full list of IP addresses in the range
IP Class Detector
Determine the classful network class (A/B/C/D/E) of an IPv4 address
Private IP Checker
Check whether an IPv4 or IPv6 address is in a private or reserved range
IP Geolocation Lookup
Display approximate geographic location, ISP, and AS info for any IP address
IPv4 Subnet Calculator
Calculate network address, broadcast, first/last usable host, subnet mask, wildcard mask, and host count from CIDR
IPv6 Subnet Calculator
Calculate network prefix, first/last address, and address count from an IPv6 CIDR
Subnet to CIDR Converter
Convert a subnet mask (e.g. 255.255.255.0) to CIDR notation (e.g. /24)
Wildcard Mask Calculator
Calculate the wildcard mask from a subnet mask and vice versa
Supernet Calculator
Find the smallest supernet (summary route) that covers multiple input subnets
VLSM Calculator
Allocate variable-length subnets from a parent CIDR given a list of required host counts
DNS Lookup
Query A, AAAA, MX, TXT, NS, CNAME, SOA records for any domain via DNS-over-HTTPS
Reverse DNS Lookup
Perform a PTR lookup for an IP address via DNS-over-HTTPS
DNS Propagation Checker
Check DNS resolution across multiple global resolvers to verify propagation status
TTL Calculator
Convert a TTL value (seconds) to human-readable duration and calculate cache expiry
WHOIS Domain Lookup
Look up registration, registrar, creation date, expiry, name servers, and DNSSEC status for any domain using RDAP.
Bandwidth Calculator
Calculate file transfer time given file size and bandwidth
Latency Calculator
Calculate round-trip time, one-way latency, and bandwidth-delay product
Network Speed Converter
Convert between bps, Kbps, Mbps, Gbps, MBps, GBps (SI and binary)
Packet Loss Impact Calculator
Estimate throughput degradation given packet loss rate and TCP RTT
Port Number Lookup
Search well-known and registered port numbers with protocol and service name
HTTP Status Code Reference
Searchable reference of all HTTP status codes with descriptions and use cases
MAC Address Lookup
Validate a MAC address and look up the vendor from the bundled OUI database
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有疑问？
常见问题
- 所有网络工具都是免费的吗？
- 是的。FileCrank上的全部24款网络工具均完全免费，无需订阅、无需API密钥，也没有任何隐藏费用。
- 我的数据会在浏览器本地处理，不会发送到服务器吗？
- 大多数工具（包括子网计算器、CIDR展开工具和带宽计算器）完全在客户端运行。DNS查询和IP地理定位工具会向第三方API发送请求，这是其功能所必需的。
- 子网计算器有什么用？
- 子网计算器接受CIDR地址块（如192.168.1.0/25），自动计算网络地址、广播地址、可用主机范围、子网掩码、反掩码和主机数量。在规划IP地址分配或备考CCNA等网络认证时不可或缺。
- 什么是 CIDR 表示法？
- CIDR（无类别域间路由）将 IP 地址及其关联的路由前缀表示为单个字符串，例如 10.0.0.0/22。斜杠后的数字表示用于网络部分的位数。FileCrank 的 CIDR 范围展开器可列出任意 CIDR 块内的每个单独 IP 地址。
- 我可以查找某个特定端口号对应的服务吗？
- 可以。端口号查询工具包含 IANA 完整的知名端口（0–1023）和已注册端口（1024–49151）注册表，包含其关联协议（TCP/UDP）和服务名称。可按端口号或服务名称搜索。
- 如何查看我的公网IP地址？
- 使用“我的IP地址”工具。它会自动检测并显示您当前的公网IPv4和IPv6地址，以及IPv4的地址类别，无需任何输入，页面加载后即可查看结果。
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