Port 911Xact Backup

Xact Backup uses TCP and UDP port 911 for backup traffic.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

1 other service is registered on port 911. compare all 2 →

Technical Details

what runs on :911

Xact Backup is registered on port :911 over tcp and udp to Bill Carroll. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is found open rarely. What's listening is often not the registered service, so check before you assume.

find what's listening on :911

this machine

# linux
sudo ss -tulpn 'sport = :911'

# macos / bsd
sudo lsof -nP -i :911

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :911

another host

nmap -sV -p T:911 <host>
sudo nmap -sU -sV -p U:911 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :911

risk score

1/ 10safe

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

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

no security notes recorded for :911 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :911
service: Xact Backup
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: IANA assigns TCP and UDP port 911 to the xact-backup service, registered to Bill Carroll. Public protocol, product, and deployment details are not identified in the registry.
lookups: 0rank 993
added: 2026-09-09
updated: 2026-09-09
references: IANA service name registry — port 911

Something wrong?

This record is maintained by the engineers who use port 911. 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 2026-09-09.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

browse categories →

ports registered around :911, by lookups.

port	service	proto	category	risk	views
:902	IdeaFarm Door Protocol	UDP	Network Services	caution	31.2k
:902	IdeaFarm Door	TCP	Network Services	caution	30.8k
:902	VMware vSphere Management	TCP	Remote Access	caution	28.7k
:902	VMware Console UDP	UDP	Remote Access	caution	28.0k
:901	Samba Web Admin (SWAT)	TCP	Web Services	caution	21.9k
:953	DNS RNDC	TCPUDP	Security	safe	16.4k
:888	CDDBP	TCP	Media	safe	9.8k
:847	DHCP Failover	TCP	Network Services	caution	9.6k

risk mix of the 8 listed

safe25%
caution75%

0 of 8 encrypted

Port :911Xact Backup

Technical Details

Security Information

Related Ports

Port 911Xact Backup