Port 31337ELDIM Secure File Upload Proxy

UDP 31337 is historically associated with Back Orifice remote-control malware; IANA also assigns TCP and UDP to ELDIM's secure upload proxy.

inSecurity File Transfer

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 7/10
lookups: 0

also known as Back Orifice, BO

1 other service is registered on port 31337. compare all 2 →

Technical Details

what runs on :31337

The registry assigns both TCP and UDP to eldim, described as a secure file upload proxy. No widely documented handshake, framing, or default configuration for this particular service is established, so do not infer a specific wire protocol from the assignment alone. In real-world port identification, UDP 31337 is best known as the default port for the original Back Orifice remote-administration tool; that is a separate use, not the IANA-assigned eldim service. Back Orifice communicates over UDP datagrams, while the IANA assignment also includes TCP.

Security Information

exposure of :31337

risk score

7/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

security averages 2.9 across 444 ports — this one sits 4.1 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

If UDP 31337 is serving Back Orifice, it may provide an attacker with remote administrative control of the host; investigate the process and traffic rather than assuming the port number identifies the service. Do not expose an unknown upload proxy or remote-administration listener to the public internet without verifying its identity, authentication, and protections. The assigned service is not commonly observed open in Nmap's scan data, and no service-specific vulnerabilities are established here.

Record

iana registry entry

port: :31337
service: ELDIM Secure File Upload Proxy
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 7/10risk
category: Security File Transfer
usage: IANA assigns eldim to a secure file upload proxy registered to Antonios A Chariton in 2021, but it is not a commonly encountered service and its public protocol behavior is not established. Separately, UDP 31337 is the classic default port for the Back Orifice remote-administration trojan; an open port alone does not prove Back Orifice is present.
lookups: 0rank 993
added: 2026-10-19
updated: 2026-10-19
references: IANA service name registry — port 31337

Something wrong?

This record is maintained by the engineers who use port 31337. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-19.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

Related Ports

all 444 in security →

the 8 most looked-up other ports in security — 444 ports carry that label.

port	service	proto	category	risk	views
:8881	Atlasz Secure Server	TCP	Web Services	caution	67.6k
:443	HTTPS	TCPtls	Web Services	caution	65.9k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Squid Proxy HTTP	TCP	Web Services	caution	45.8k
:8080	HTTP Alternate	TCP	Web Services	caution	44.9k
:7000	Vuze HTTPS Tracker	TCPtls	Security	caution	28.9k

risk mix of the 8 listed

caution100%

2 of 8 encrypted

Port :31337ELDIM Secure File Upload Proxy

Technical Details

Security Information

Related Ports

Port 31337ELDIM Secure File Upload Proxy