Port 1113Licklider Transmission Protocol

A delay-tolerant transport for reliable data transfer across deep-space and intermittently connected links.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

also known as ltp-deepspace, LTP

Technical Details

what runs on :1113

LTP is a transaction-oriented, delay-tolerant protocol designed for long-delay or disrupted links. It commonly runs over UDP, although this assignment also covers TCP, and uses session identifiers plus data and control segments to provide reliability for red-part data while allowing optional less-reliable green-part data. Checkpoints, reports, retransmission, cancellation, and status signaling support delivery across links where long-lived TCP connections are unsuitable. LTP does not define encryption or authentication; security is normally provided by the surrounding DTN or link-security system.

Security Information

exposure of :1113

risk score

2/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 3.8 across 654 ports — this one sits 1.8 below.

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

LTP traffic is not encrypted or authenticated by default, so an exposed listener could be spoofed or subjected to malformed-segment, state-exhaustion, and resource-consumption attacks. Because this is a specialized DTN protocol and is rarely expected from the public internet, port 1113 should generally be restricted to authorized spacecraft, ground, or overlay peers and protected with link security, IPsec, or an equivalent control.

Record

iana registry entry

port: :1113
service: Licklider Transmission Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services System
usage: LTP is used as a convergence-layer transport in delay-tolerant networking, especially for spacecraft, ground stations, and other intermittently connected nodes. Engineers usually encounter it in DTN implementations rather than on ordinary internet-facing servers; deployments commonly use UDP on port 1113.
lookups: 0rank 994
added: 2026-08-22
updated: 2026-08-22
references: IANA service name registry — port 1113
RFC 5326
RFC 7122

Something wrong?

This record is maintained by the engineers who use port 1113. 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 2026-08-22.

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Related Ports

all 654 in network services →

the 8 most looked-up other ports in network services — 654 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:6543	Jetnet	UDP	Network Services	caution	65.3k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :1113Licklider Transmission Protocol

Technical Details

Security Information

Related Ports

Port 1113Licklider Transmission Protocol