Source: https://github.com/SynoCommunity/spksrc/wiki/Synology-Used-Ports
| Application/Service | Protocol | Port |
|---|---|---|
| FTP | TCP | 20, 21, 55536, 55537 |
| SSH | TCP | 22 |
| Telnet | TCP | 23 |
| SMTP | TCP | 25 |
| DNS | Both | 53 |
| DHCP | UDP | 67-68 |
| TFTP | TCP | 69 |
| HTTP | TCP | 80 |
| TCP | 110 | |
| NFS | TCP | 111, 892, 2049 |
| NTP | TCP | 123 |
| High Availability | Both | 123, 874, 5405, 5406, 7400-7999 |
| CIFS | TCP | 137-139, 445 |
| IMAP | TCP | 143 |
| SNMP | TCP | 161 |
| LDAP | TCP | 389 |
| HTTPS | TCP | 443 |
| SMTPS | TCP | 465 |
| IPSEC | UDP | 500, 4500 |
| Syslog | UDP | 514 |
| LPR Print | TCP | 515 |
| DHCPv6 | UDP | 546,547 |
| AFP | TCP | 548 |
| IPP Print | TCP | 631 |
| LDAPS | TCP | 636 |
| RSync | TCP | 873 |
| IMAPS | TCP | 993 |
| POPS | TCP | 995 |
| OpenVPN | UDP | 1194 |
| Synology Assistant | TCP | 1234, 9997-9999 |
| IPSEC | TCP | 1701 |
| PPTP | TCP | 1723 |
| UPnP | UDP | 1900 |
| MFP Print | TCP | 3240-3259 |
| iSCSI | TCP | 3260-3262 |
| MySQL | TCP | 3306 |
| UPS | TCP | 3493 |
| iTune | TCP | 3689 |
| eMule | TCP | 4662 |
| eMule | UDP | 4672 |
| DSM | TCP | 5000-5001 |
| Video Station | TCP | 5002, 5004, 9025-9040, 65001 |
| WebDAV | TCP | 5005-5006 |
| Bonjour | TCP | 5353 |
| AirPlay | UDP | 6001-6010 |
| AirPlay | TCP | 6011-6030 |
| Version Backup | TCP | 6281 |
| Cloud Station | TCP | 6690 |
| BiTorrent | UDP | 6881 |
| File Station | TCP | 7001 |
| Download Station | TCP | 8001 |
| Audio Station | TCP | 8801 |
| Logitech Media Server | TCP | 9002, 3483 |
| Surveillance Station | TCP | 9900-9901, 19997-19998 |
| BiTorrent | TCP | 16881 |
| Radius | TCP | 1812, 18120 |
| Visual Station | UDP | 19999 |
| DLNA | TCP | 50001-50002 |
| SSDP | UDP | 55900-55910 |