In today’s digital landscape, ports and IP addresses form the backbone of all network communication. Whether you’re configuring a server, firewall, or cloud resource, understanding standard ports and IP ranges is essential.
🔢 Port Number Ranges
| Range |
Description |
Port Numbers |
| Well-known ports |
Assigned to core services (HTTP, DNS, etc.) |
0 – 1023 |
| Registered ports |
Assigned to specific apps/services |
1024 – 49151 |
| Dynamic/Ephemeral ports |
Used for temporary communications |
49152 – 65535 |
🌐 Common TCP/UDP Ports
| Port |
Protocol |
Service |
| 20 |
TCP |
FTP Data Transfer |
| 21 |
TCP |
FTP Control |
| 22 |
TCP |
SSH |
| 23 |
TCP |
Telnet |
| 25 |
TCP |
SMTP |
| 53 |
TCP/UDP |
DNS |
| 67 |
UDP |
DHCP Server |
| 68 |
UDP |
DHCP Client |
| 69 |
UDP |
TFTP |
| 80 |
TCP |
HTTP |
| 110 |
TCP |
POP3 |
| 119 |
TCP |
NNTP |
| 123 |
UDP |
NTP |
| 135 |
TCP/UDP |
Microsoft RPC |
| 137–139 |
TCP/UDP |
NetBIOS |
| 143 |
TCP |
IMAP |
| 161 |
UDP |
SNMP |
| 162 |
UDP |
SNMP Trap |
| 179 |
TCP |
BGP |
| 389 |
TCP/UDP |
LDAP |
| 443 |
TCP |
HTTPS |
| 445 |
TCP |
SMB |
| 465 |
TCP |
SMTPS |
| 500 |
UDP |
IPsec IKE |
| 514 |
UDP |
Syslog |
| 515 |
TCP |
LPD |
| 587 |
TCP |
SMTP (Auth) |
| 631 |
TCP/UDP |
IPP |
| 636 |
TCP |
LDAPS |
| 873 |
TCP |
rsync |
| 993 |
TCP |
IMAPS |
| 995 |
TCP |
POP3S |
| 1080 |
TCP |
SOCKS Proxy |
| 1433 |
TCP |
Microsoft SQL Server |
| 1434 |
UDP |
SQL Server Browser |
| 1521 |
TCP |
Oracle DB |
| 1701 |
UDP |
L2TP VPN |
| 1812 |
UDP |
RADIUS Auth |
| 1813 |
UDP |
RADIUS Accounting |
| 1883 |
TCP |
MQTT |
| 2049 |
TCP/UDP |
NFS |
| 2375 |
TCP |
Docker (non-TLS) |
| 2376 |
TCP |
Docker (TLS) |
| 3306 |
TCP |
MySQL |
| 3389 |
TCP |
RDP |
| 3690 |
TCP |
Subversion |
| 4369 |
TCP |
Erlang Port Mapper |
| 5000 |
TCP |
Flask / Docker Registry |
| 5060 |
TCP/UDP |
SIP |
| 5061 |
TCP |
SIP over TLS |
| 5432 |
TCP |
PostgreSQL |
| 5671 |
TCP |
AMQP over TLS |
| 5672 |
TCP |
AMQP (RabbitMQ) |
| 5900 |
TCP |
VNC |
| 5985 |
TCP |
WinRM (HTTP) |
| 5986 |
TCP |
WinRM (HTTPS) |
| 6379 |
TCP |
Redis |
| 8080 |
TCP |
HTTP Alternate |
| 8443 |
TCP |
HTTPS Alternate |
| 9000 |
TCP |
SonarQube / PHP-FPM |
| 9090 |
TCP |
Prometheus |
| 9200 |
TCP |
Elasticsearch (API) |
| 9300 |
TCP |
Elasticsearch (Cluster) |
| 11211 |
TCP/UDP |
Memcached |
| 27017 |
TCP |
MongoDB |
🌍 IP Address Ranges Explained
🔐 Private IP Ranges (RFC 1918)
| Class |
Range |
CIDR |
IPs |
| A |
10.0.0.0 – 10.255.255.255 |
10.0.0.0/8 |
16.7 million |
| B |
172.16.0.0 – 172.31.255.255 |
172.16.0.0/12 |
1 million |
| C |
192.168.0.0 – 192.168.255.255 |
192.168.0.0/16 |
65,536 |
🌐 Public IP Addresses
Any IP address not in the above private ranges is considered public and routable on the internet.
Example Public IPs:
- 8.8.8.8 (Google DNS)
- 1.1.1.1 (Cloudflare DNS)
📘 Quick Reference Table
| Category |
Range or Example |
| Well-known Ports |
0 – 1023 |
| Registered Ports |
1024 – 49151 |
| Dynamic/Ephemeral |
49152 – 65535 |
| Private IP (Class A) |
10.0.0.0 – 10.255.255.255 |
| Private IP (Class B) |
172.16.0.0 – 172.31.255.255 |
| Private IP (Class C) |
192.168.0.0 – 192.168.255.255 |
| Public IPs |
Anything outside private ranges |
Published by Manjunath
“Life is about passions. Thank you for sharing mine” -- M. Schumacher
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