Common ports scan: TCP-connects to 12 well-known ports (FTP 21, SSH 22, SMTP 25, HTTP 80, HTTPS 443, MySQL 3306, Postgres 5432, Redis 6379, 8080, 8443, Elasticsearch 9200, MongoDB 27017) and reports which are open. Quick exposure check for a host you operate. Cloudflare-fronted hosts cannot be probed. $0.01 per host.

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