knownports / Ports 500–599 / Port 563
Port563
nntpsnntp protocol over TLS/SSL (was snntp)
IANA has registered port 563 to nntps on TCP and UDP. The entry cites RFC 4642. It is the TLS counterpart of nntp on port 119.
Registry entries
| Service | Protocols | Registered | Modified | RFCs | Other specs |
|---|---|---|---|---|---|
nntps | TCPUDP | — | Jul 6, 2018 | RFC 4642 | — |
Cited RFCs
| RFC | Title | Published | Status | Later changes |
|---|---|---|---|---|
| RFC 4642 | Using Transport Layer Security (TLS) with Network News Transfer Protocol (NNTP) | October 2006 | Proposed Standard | updated by RFC 8143, RFC 8996 |
Where it sits in the registry
Port 563 is one of 99 numbers with an assignment in ports 500–599 (99.0% of the range). 98 other numbers in the range are assigned on exactly the same transports, TCP and UDP, the usual pattern for older entries. The registry records no registration date for it, as for 98 other numbers in the range; dates were recorded mainly from 2002 on. IANA last modified the entry on July 6, 2018. Three other numbers in the registry carry the same modification date, a sign of one batch update.
Status on each protocol
| Protocol | On port 563 | Other numbers with the same status | Nearest with the same status |
|---|---|---|---|
| TCP | assigned to nntps | 5,887 | 562 chshell |
| UDP | assigned to nntps | 5,500 | 562 chshell |
| SCTP | no entry | 5,999 | 562 chshell |
| DCCP | no entry | 6,080 | 562 chshell |
5,273 other assigned numbers in the registry have exactly this combination across all four protocols.
The nearest assigned numbers
| Port | Service | Label | Protocols | Registered | Distance |
|---|---|---|---|---|---|
| 560 | rmonitor | rmonitord | TCPUDP | — | 3 |
| 561 | monitor | — | TCPUDP | — | 2 |
| 562 | chshell | chcmd | TCPUDP | — | 1 |
| 564 | 9pfs | plan 9 file service | TCPUDP | — | 1 |
| 565 | whoami | — | TCPUDP | — | 2 |
| 566 | streettalk | — | TCPUDP | — | 3 |
Listed in Ports that cite an RFC · Plain and TLS port pairs