Network Port Reference

Comprehensive database of common network ports with security implications

Reference Database

This tool provides information about common network ports and their services. To scan for open ports on a system, use tools like nmap, netstat, or specialized network scanners.

Search by port, service, or description

Category

Protocol

Showing 5986 of 5986 ports

Per page:

Port	Protocol	Service	Description	Category	Security
1	Both	tcpmux	Multiplexer	Other	Configure firewall rules and authentication appropriately.
5	Both	rje	Entry	Other	Configure firewall rules and authentication appropriately.
7	Both	echo	Echo	Network	Configure firewall rules and authentication appropriately.
9	Both	discard	Discard	Network	Configure firewall rules and authentication appropriately.
11	Both	systat	Users	Other	Configure firewall rules and authentication appropriately.
13	Both	daytime	Daytime	Network	Configure firewall rules and authentication appropriately.
17	Both	qotd	Day	Network	Configure firewall rules and authentication appropriately.
18	Both	msp	(historic)	Other	Configure firewall rules and authentication appropriately.
19	Both	chargen	Generator	Network	Configure firewall rules and authentication appropriately.
20	Both	ftp-data	Data]	File Transfer	Configure firewall rules and authentication appropriately.
21	Both	ftp	[Control]	File Transfer	🟡 Unencrypted. Use encrypted alternative or VPN. Restrict network access.
22	Both	ssh	Protocol	File Transfer	🟢 Encrypted protocol. Ensure strong cipher suites and valid certificates.
23	Both	telnet	Telnet	Remote Access	🔴 Critical risk. Frequently exploited. Never expose to internet.
25	Both	smtp	Transfer	Mail	🟡 Unencrypted. Use encrypted alternative or VPN. Restrict network access.
27	Both	nsw-fe	FE	Other	Configure firewall rules and authentication appropriately.
29	Both	msg-icp	ICP	Other	Configure firewall rules and authentication appropriately.
31	Both	msg-auth	Authentication	Other	Configure firewall rules and authentication appropriately.
33	Both	dsp	Protocol	Other	Configure firewall rules and authentication appropriately.
37	Both	time	Time	Time	Configure firewall rules and authentication appropriately.
38	Both	rap	Protocol	Other	Configure firewall rules and authentication appropriately.
39	Both	rlp	Protocol	Other	Configure firewall rules and authentication appropriately.
41	Both	graphics	Graphics	Other	Configure firewall rules and authentication appropriately.
42	Both	name	Server	Other	Configure firewall rules and authentication appropriately.
43	Both	nicname	Is	Other	Configure firewall rules and authentication appropriately.
44	Both	mpm-flags	Protocol	Other	Configure firewall rules and authentication appropriately.
45	Both	mpm	[recv]	Other	Configure firewall rules and authentication appropriately.
46	Both	mpm-snd	send]	Other	Configure firewall rules and authentication appropriately.
48	Both	auditd	Daemon	Other	Configure firewall rules and authentication appropriately.
49	Both	tacacs	(TACACS)	Other	Configure firewall rules and authentication appropriately.
50	Both	re-mail-ck	Protocol	Mail	Configure firewall rules and authentication appropriately.
52	Both	xns-time	Protocol	Time	Configure firewall rules and authentication appropriately.
53	Both	domain	Server	DNS	Configure firewall rules and authentication appropriately.
54	Both	xns-ch	Clearinghouse	Other	Configure firewall rules and authentication appropriately.
55	Both	isi-gl	Language	Other	Configure firewall rules and authentication appropriately.
56	Both	xns-auth	Authentication	Other	Configure firewall rules and authentication appropriately.
58	Both	xns-mail	Mail	Mail	Configure firewall rules and authentication appropriately.
62	Both	acas	Services	Other	Configure firewall rules and authentication appropriately.
63	Both	whoispp	whois++	Other	Configure firewall rules and authentication appropriately.
64	Both	covia	(CI)	Other	Configure firewall rules and authentication appropriately.
65	Both	tacacs-ds	Service	Other	Configure firewall rules and authentication appropriately.
66	Both	sql-net	SQL*NET	Database	Configure firewall rules and authentication appropriately.
67	Both	bootps	Server	Network	Configure firewall rules and authentication appropriately.
68	Both	bootpc	Client	Network	Configure firewall rules and authentication appropriately.
69	Both	tftp	Transfer	File Transfer	🟡 Unencrypted. Use encrypted alternative or VPN. Restrict network access.
70	Both	gopher	Gopher	Other	Configure firewall rules and authentication appropriately.
71	Both	netrjs-1	Service	Other	Configure firewall rules and authentication appropriately.
72	Both	netrjs-2	Service	Other	Configure firewall rules and authentication appropriately.
73	Both	netrjs-3	Service	Other	Configure firewall rules and authentication appropriately.
74	Both	netrjs-4	Service	Other	Configure firewall rules and authentication appropriately.
76	Both	deos	Store	Other	Configure firewall rules and authentication appropriately.

Page 1 of 120

Security Indicator Legend

Green: Secure/Encrypted

Yellow: Conditional Security

Red: Critical/Dangerous

Gray: Unknown/Not in DB

Common Port Groups

Security Best Practices

•Never expose database ports (3306, 5432, 1433, 27017, 6379) to the internet. Use SSH tunnels or VPNs.
•Disable legacy protocols like Telnet (23), FTP (21), and HTTP (80) in favor of encrypted alternatives.
•Use firewalls to restrict access to only necessary ports and trusted IP addresses.
•Enable authentication on all services, especially those that default to no auth (Redis, Memcached, MongoDB).
•Regularly audit open ports using tools like nmap, netstat, or ss to identify unexpected services.