knownports / Ports 500–599 / Port 587
Port587
submissionMessage Submission
IANA has registered port 587 to submission on TCP and UDP. The entry cites RFC 6409. Its TLS counterpart, submissions, is registered on port 465.
Registry entries
| Service | Protocols | Registered | Modified | RFCs | Other specs |
|---|---|---|---|---|---|
submission | TCPUDP | — | Nov 17, 2011 | RFC 6409 | — |
Cited RFCs
| RFC | Title | Published | Status | Later changes |
|---|---|---|---|---|
| RFC 6409 | Message Submission for Mail | November 2011 | Internet Standard | updated by RFC 8314 |
Where it sits in the registry
Port 587 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 November 17, 2011. No other number in the registry shares that modification date.
Status on each protocol
| Protocol | On port 587 | Other numbers with the same status | Nearest with the same status |
|---|---|---|---|
| TCP | assigned to submission | 5,887 | 586 password-chg |
| UDP | assigned to submission | 5,500 | 586 password-chg |
| SCTP | no entry | 5,999 | 586 password-chg |
| DCCP | no entry | 6,080 | 586 password-chg |
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 |
|---|---|---|---|---|---|
| 583 | philips-vc | Philips Video-Conferencing | TCPUDP | — | 4 |
| 584 | keyserver | Key Server | TCPUDP | — | 3 |
| 586 | password-chg | Password Change | TCPUDP | — | 1 |
| 588 | cal | — | TCPUDP | — | 1 |
| 589 | eyelink | — | TCPUDP | — | 2 |
| 590 | tns-cml | TNS CML | TCPUDP | — | 3 |
Other entries that mention submission
The text submission appears in the name or label of two other registry entries, every one shown here. It is a text match, not a statement that the services are related.
- 465
submissions“Message Submission over TLS protocol” - no number,
pgpkey-mailto“PGP Key submission using SMTP”
Listed in Ports that cite an RFC · Plain and TLS port pairs · Mail ports: smtp, submission, imap and pop3