From 53f4e08688fb450fc550a06ecd0a764feb9e20be Mon Sep 17 00:00:00 2001
From: Marcel Bischoff <marcel@herrbischoff.com>
Date: Tue, 13 Oct 2015 23:45:59 +0200
Subject: [PATCH] Add TCP/IP category and entry

---
 README.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/README.md b/README.md
index 28d2642..ff99a79 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,7 @@ If you want to contribute, you are highly encouraged to do so. Please read the [
     - [DNS](#dns)
     - [Hostname](#hostname)
     - [Networking Tools](#networking-tools)
+    - [TCP/IP](#tcp-ip)
     - [Wi-Fi](#wi-fi)
 - [Package Managers](#package-managers)
 - [Printing](#printing)
@@ -389,6 +390,14 @@ ping -o github.com
 traceroute github.com
 ```
 
+### TCP/IP
+
+#### Show Application Using a Certain Port
+This outputs all applications currently using port 80.
+```bash
+sudo lsof -i :80
+```
+
 ### Wi-Fi
 
 #### Scan Available Access Points