Hurricane Electric BGP Toolkit(显示你的IP地址、所在IP段和自治系统编号信息) https://bgp.he.net/report/world
cloudflare.com词汇表 https://www.cloudflare.com/learning/access-management/what-is-a-vpn/
as编号 http://www.iana.org/assignments/as-numbers/as-numbers.xhtml
as查询工具 http://projects.arin.net/arincli_html/arincli.7.html#INSTALLATION
Whois /注册数据访问协议(RDAP) https://www.arin.net/resources/registry/whois/rdap/
路由注册表列表 http://www.irr.net/docs/list.html#ALTDB
APNIC Whois中的高级搜索 https://www.apnic.net/manage-ip/using-whois/searching/query-options/