netstat\u00a0-tuln<\/code><\/pre>\nHere’s what each option means:<\/strong><\/p>\n\n- -t<\/strong>: Show TCP (Transmission Control Protocol) ports.<\/li>\n
- -u<\/strong>: Show UDP (User Datagram Protocol) ports.<\/li>\n
- -l<\/strong>: Show only ports that are actively listening.<\/li>\n
- -n<\/strong>: Skip translating program names (e.g., “ssh”) into port numbers, which makes it faster.<\/li>\n<\/ul>\n
What You’ll See:<\/strong><\/p>\nProto Recv-Q Send-Q Local Address \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Foreign Address \u00a0 \u00a0 \u00a0 \u00a0 State\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\ntcp\u00a0 \u00a0 \u00a0 \u00a0 0\u00a0 \u00a0 \u00a0 0 0.0.0.0:22\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 0.0.0.0:* \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 LISTEN\u00a0\u00a0\u00a0\u00a0\u00a0\nudp\u00a0 \u00a0 \u00a0 \u00a0 0\u00a0 \u00a0 \u00a0 0 0.0.0.0:68\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 0.0.0.0:*<\/code><\/pre>\nHere’s how to read this:<\/strong><\/p>\n\n- Proto:<\/strong> Shows whether it’s TCP or UDP.<\/li>\n
- Local Address: <\/strong>Your machine’s IP and the port in use.<\/li>\n
- Foreign Address:<\/strong> The IP and port of the other machine (or\u00a0* if it’s open to all).<\/li>\n
- State:<\/strong> For TCP,\u00a0LISTEN means it’s waiting for connections.<\/li>\n<\/ul>\n
Quick Note:<\/strong> netstat is part of the net-tools package, which may not come pre-installed on newer Linux versions. Install it using:<\/p>\nsudo\u00a0apt\u00a0install\u00a0net-tools\u00a0\u00a0#\u00a0On\u00a0Debian\/Ubuntu\u00a0\u00a0\nsudo\u00a0yum\u00a0install\u00a0net-tools\u00a0\u00a0#\u00a0On\u00a0RHEL\/CentOS\u00a0<\/code><\/pre>\n2. Using ss<\/h3>\n
ss<\/strong> is a newer, faster alternative to\u00a0netstat. It gives similar information but works better on modern systems.<\/p>\nRun the following command:<\/strong><\/p>\nss\u00a0-tuln<\/code><\/pre>\nThe options are the same as\u00a0netstat, so you should be able to jump right in.<\/p>\n
What You’ll See:<\/strong><\/p>\nNetid \u00a0 State\u00a0 \u00a0 \u00a0 Recv-Q Send-Q Local Address:Port \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Peer Address:Port\ntcp \u00a0 \u00a0 LISTEN \u00a0 \u00a0 0\u00a0 \u00a0 \u00a0 128\u00a0 \u00a0 0.0.0.0:22\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 0.0.0.0:*\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\nudp \u00a0 \u00a0 UNCONN \u00a0 \u00a0 0\u00a0 \u00a0 \u00a0 0\u00a0 \u00a0 \u00a0 0.0.0.0:68\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 0.0.0.0:*<\/code><\/pre>\nThis output is similar to\u00a0netstat, but ss<\/strong> tends to be faster, especially if you’re dealing with a lot of connections.<\/p>\n3. Using lsof<\/h3>\n
lsof<\/strong> (List Open Files) is a handy tool for seeing which files or network connections are being used by processes.<\/p>\nTo see which ports are open and what’s using them, run:<\/strong><\/p>\nsudo\u00a0lsof\u00a0-i\u00a0-P\u00a0-n<\/code><\/pre>\n\n- -i<\/strong>: Filters for network-related files.<\/li>\n
- -P<\/strong>: Shows raw port numbers instead of service names.<\/li>\n
- -n<\/strong>: Skips translating IP addresses to hostnames for speed.<\/li>\n<\/ul>\n
What You’ll See:<\/strong><\/p>\nCOMMAND \u00a0 PID\u00a0 USER \u00a0 FD \u00a0 TYPE DEVICE SIZE\/OFF NODE NAME\nsshd\u00a0 \u00a0 \u00a0 1234 root \u00a0 3u\u00a0 IPv4\u00a0 12345\u00a0 \u00a0 \u00a0 0t0\u00a0 TCP *:22 (LISTEN)\ndhclient\u00a0 5678 root \u00a0 6u\u00a0 IPv4\u00a0 54321\u00a0 \u00a0 \u00a0 0t0\u00a0 UDP *:68<\/code><\/pre>\n\n- COMMAND<\/strong>: The program using the port.<\/li>\n
- PID<\/strong>: The process ID.<\/li>\n
- NAME<\/strong>: The port and protocol (e.g., TCP on port 22).<\/li>\n<\/ul>\n
Why It’s Useful:<\/h4>\n
If you’re troubleshooting and need to find out which process is using a specific port, lsof<\/strong> is your go-to tool.<\/p>\n4. Using nmap<\/h3>\n
nmap<\/strong> (Network Mapper) is ideal for scanning networks and checking which ports are open.<\/p>\nTo scan all ports, run:<\/strong><\/p>\nsudo\u00a0nmap\u00a0-sT\u00a0-p-\u00a0localhost<\/code><\/pre>\n\n- -sT<\/strong>: Performs a TCP connect scan.<\/li>\n
- -p-<\/strong>: Scans all 65,535 ports.<\/li>\n<\/ul>\n
What You’ll See:<\/strong><\/p>\nPORT \u00a0 \u00a0 STATE SERVICE\n22\/tcp \u00a0 open\u00a0 ssh\n80\/tcp \u00a0 open\u00a0 http\n443\/tcp\u00a0 open\u00a0 https<\/code><\/pre>\n\n- PORT<\/strong>: The port number and protocol (TCP or UDP).<\/li>\n
- STATE<\/strong>: Tells you if the port is\u00a0open,\u00a0closed, or\u00a0filtered (blocked by a firewall).<\/li>\n
- SERVICE<\/strong>: The common name of the service using the port.<\/li>\n<\/ul>\n
Why nmap is Useful:<\/strong><\/p>\nnmap<\/strong> is great if you want a complete view of all open ports on your system or need to scan another machine.<\/p>\n5. Using nc (Netcat)<\/h3>\n
Netcat<\/strong> is a simple but powerful tool for checking if a specific port is open.<\/p>\nTo check if port 22 is open, type:<\/strong><\/p>\nnc\u00a0-zv\u00a0localhost\u00a022<\/code><\/pre>\n\n- -z<\/strong>: Just scan for open ports without sending data.<\/li>\n
- -v<\/strong>: Show detailed output.<\/li>\n<\/ul>\n
What You’ll See:<\/strong><\/p>\nConnection\u00a0to\u00a0localhost\u00a022\u00a0port\u00a0[tcp\/ssh]\u00a0succeeded!\n<\/code><\/pre>\nWhy It’s Useful:<\/strong><\/p>\nIf you just need to quickly check whether a specific port is open, nc<\/strong> does the job without much fuss.<\/p>\nMaking Sense of the Results<\/h2>\n
When you check ports, here’s what the results usually mean:<\/p>\n
\n- Listening\/Open Ports:<\/strong> These ports are ready to accept connections. For example, a web server will listen on port 80 or 443.<\/li>\n
- Closed Ports:<\/strong> These ports aren’t in use, so they won’t accept connections.<\/li>\n
- Filtered Ports:<\/strong> These ports are blocked by a firewall or security rule, so they appear invisible.<\/li>\n<\/ul>\n
Common Scenarios<\/h4>\n
When checking ports, you may come across the following scenarios:<\/p>\n
\n- You see a port open you didn’t expect: <\/strong>This might mean a program is running that you don’t need or recognize. It’s a good idea to investigate further.<\/li>\n
- A port you need is closed:<\/strong> The program might not be running, or a firewall could be blocking it.<\/li>\n<\/ul>\n
Securing Your System<\/h2>\n
Checking ports is just the first step. Here are a few ways to tidy things up:<\/p>\n
Stop Unnecessary programs:<\/strong>
If a program is running on a port you don’t need, turn it off:<\/p>\nsudo systemctl stop \nsudo systemctl disable <\/service_name><\/code><\/pre>\nUse a Firewall:<\/strong>
Limit access to ports using a tool like\u00a0ufw\u00a0(Uncomplicated Firewall):<\/p>\nsudo ufw allow 22 \u00a0 \u00a0 # Allow SSH\u00a0\u00a0\nsudo ufw deny 80\u00a0 \u00a0 \u00a0 # Block HTTP<\/code><\/pre>\nRegularly Monitor Ports:<\/strong>
Make it a habit to check open ports now and then, especially if you’re running a server.<\/p>\nWrapping Up<\/h2>\n
Checking ports in Linux doesn’t have to be complicated. Whether you use\u00a0netstat,\u00a0ss,\u00a0lsof,\u00a0nmap, or\u00a0nc, each tool gives you a slightly different view of what’s going on. Pick the one that works best for your needs and don’t be afraid to explore. The more you practice, the easier it gets!<\/p>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"
Ports are like doorways that let apps and programs on your Linux system send and receive data. If you want to see which ports are in use, which ones are open, or just figure out what’s going on with your network, you’ve come to the right place. In this guide, we’ll walk through multiple ways […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[95],"tags":[855,19046,1224,19045,8023],"dealstore":[],"offerexpiration":[],"class_list":["post-27955","post","type-post","status-publish","format-standard","hentry","category-internet-business","tag-check","tag-linux","tag-open","tag-ports","tag-ways"],"yoast_head":"\n
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<\/p>\n