// REFERENCE · PORTS
What is that port?
81 ports explained for people who just found one open on their router, their NAS or their phone: what listens there, which household devices use it, and what it means if it is reachable from the internet.
SEARCH BY NUMBER OR SERVICE
20FTP dataTCPMEDIUM RISK IF EXPOSED21FTPTCPMEDIUM RISK IF EXPOSED22SSHTCPMEDIUM RISK IF EXPOSED23TelnetTCPHIGH RISK IF EXPOSED25SMTPTCPLOW RISK IF EXPOSED53DNSTCP/UDPMEDIUM RISK IF EXPOSED67DHCP serverUDPLOW RISK IF EXPOSED68DHCP clientUDPINFORMATIONAL69TFTPUDPHIGH RISK IF EXPOSED80HTTPTCPLOW RISK IF EXPOSED88KerberosTCP/UDPMEDIUM RISK IF EXPOSED110POP3TCPMEDIUM RISK IF EXPOSED111RPC portmapperTCP/UDPHIGH RISK IF EXPOSED119NNTPTCPLOW RISK IF EXPOSED123NTPUDPLOW RISK IF EXPOSED135MS RPCTCPHIGH RISK IF EXPOSED137NetBIOS Name ServiceUDPMEDIUM RISK IF EXPOSED139NetBIOS SessionTCPHIGH RISK IF EXPOSED143IMAPTCPMEDIUM RISK IF EXPOSED161SNMPUDPMEDIUM RISK IF EXPOSED389LDAPTCP/UDPMEDIUM RISK IF EXPOSED443HTTPSTCP/UDPINFORMATIONAL445SMBTCPHIGH RISK IF EXPOSED465SMTPSTCPLOW RISK IF EXPOSED500IKE (IPsec VPN)UDPLOW RISK IF EXPOSED514SyslogTCP/UDPMEDIUM RISK IF EXPOSED548AFPTCPHIGH RISK IF EXPOSED554RTSPTCPHIGH RISK IF EXPOSED587SMTP submissionTCPLOW RISK IF EXPOSED631IPP / CUPSTCP/UDPHIGH RISK IF EXPOSED636LDAPSTCPMEDIUM RISK IF EXPOSED873rsyncTCPHIGH RISK IF EXPOSED993IMAPSTCPLOW RISK IF EXPOSED995POP3STCPLOW RISK IF EXPOSED1194OpenVPNUDPLOW RISK IF EXPOSED1433Microsoft SQL ServerTCPHIGH RISK IF EXPOSED1723PPTP VPNTCPMEDIUM RISK IF EXPOSED1880Node-REDTCPHIGH RISK IF EXPOSED1883MQTTTCPHIGH RISK IF EXPOSED1900SSDP / UPnPUDPHIGH RISK IF EXPOSED2000Cisco SCCP / MikroTik btestTCPMEDIUM RISK IF EXPOSED2049NFSTCP/UDPHIGH RISK IF EXPOSED3000Dev servers / GrafanaTCPMEDIUM RISK IF EXPOSED3283Apple Remote DesktopTCP/UDPMEDIUM RISK IF EXPOSED3306MySQLTCPHIGH RISK IF EXPOSED3389RDPTCPHIGH RISK IF EXPOSED3689DAAPTCPMEDIUM RISK IF EXPOSED4500IPsec NAT traversalUDPLOW RISK IF EXPOSED4567Sinatra / ISP managementTCPMEDIUM RISK IF EXPOSED5000Synology DSM / UPnP / devTCPHIGH RISK IF EXPOSED5060SIPTCP/UDPMEDIUM RISK IF EXPOSED5061SIP over TLSTCPLOW RISK IF EXPOSED5228Google push (FCM)TCPINFORMATIONAL5353mDNSUDPLOW RISK IF EXPOSED5432PostgreSQLTCPHIGH RISK IF EXPOSED5555Android Debug BridgeTCPHIGH RISK IF EXPOSED5900VNCTCPHIGH RISK IF EXPOSED5985WinRM HTTPTCPHIGH RISK IF EXPOSED6379RedisTCPHIGH RISK IF EXPOSED6881BitTorrentTCP/UDPLOW RISK IF EXPOSED7000AirPlayTCPMEDIUM RISK IF EXPOSED7547TR-069 (CWMP)TCPHIGH RISK IF EXPOSED7680Delivery OptimizationTCPLOW RISK IF EXPOSED8000HTTP alternateTCPMEDIUM RISK IF EXPOSED8008Chromecast HTTPTCPHIGH RISK IF EXPOSED8009Google Cast / AJPTCPHIGH RISK IF EXPOSED8080HTTP alternateTCPMEDIUM RISK IF EXPOSED8123Home AssistantTCPMEDIUM RISK IF EXPOSED8291MikroTik WinboxTCPHIGH RISK IF EXPOSED8443HTTPS alternateTCPMEDIUM RISK IF EXPOSED8883MQTT over TLSTCPMEDIUM RISK IF EXPOSED8888Jupyter / HTTP alternateTCPHIGH RISK IF EXPOSED9000PHP-FPM / Portainer / MinIOTCPMEDIUM RISK IF EXPOSED9100Raw printing (JetDirect)TCPHIGH RISK IF EXPOSED9200ElasticsearchTCPHIGH RISK IF EXPOSED10000WebminTCPHIGH RISK IF EXPOSED27017MongoDBTCPHIGH RISK IF EXPOSED32400Plex Media ServerTCPMEDIUM RISK IF EXPOSED49152Dynamic port range startTCP/UDPMEDIUM RISK IF EXPOSED51820WireGuardUDPLOW RISK IF EXPOSED62078iPhone syncTCPLOW RISK IF EXPOSED
ON YOUR PHONE · PORT SCAN
Finding out which of these are open on your own devices takes a scan from inside the network. The app runs one from your phone, names the service on each open port, and can check the same address from the outside to see what the internet sees. Get RECON for iPhone — one-time purchase, no account, nothing leaves the device.