查询老域名,看看是不是available:
http://www.expireddomains.net
http://moonsy.com/expired_domains
http://www.bulkdachecker.com
http://whois.domaintools.com
查老域名链接,排除外链中有spam的玉米
http://www.openlinkprofiler.org
http://siteexplorer.info/domain/
https://moz.com/researchtools/ose/
https://majestic.com
https://cmn.ahrefs.com/reports/
查老域名快照,看看是否是作弊,301等
https://archive.org/web/
http://www.screenshots.com/