diff --git a/README.md b/README.md
index 19b4956..ad886cc 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,29 @@
-# kd-ipchanger
-Change your public ip address of Kabel Deutschland on the fly...
+# Kabel Deutschland IPchanger
+This is a proof of concept that shows it is possible to change your public Kabel Deutschland IP address on the fly (without rebooting any device at all). Use at your own risk.
+
+## Setup
+
+- Netgear WNDR3700v4 router...
+- ...behind bridged Kabel Deutschland Hitron CVE modem
+
+## How?
+
+The script temporarily spoofs the MAC address of the Netgear router so that the provider thinks a new gateway was connected. Afterwards the MAC address is set back to normal resulting in a new IP.
+
+## Usage
+
+`./changeip.sh [gatewayip] [username] [password]`
+
+Example:
+
+`./changeip.sh 192.168.178.1 admin mysecret`
+
+Output:
+
+    Old IP: 188.191.210.163
+    New IP: 188.191.206.38
+
+
+## Contributions
+
+Feel free to contribute by submitting pull requests.
\ No newline at end of file
diff --git a/changeip.sh b/changeip.sh
new file mode 100755
index 0000000..ac82544
--- /dev/null
+++ b/changeip.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+gatewayip=$1
+username=$2
+password=$3
+
+if [  $# -le 2 ]
+then
+    echo -e "Usage:\n$0 [gatewayip] [username] [password]"
+    exit 1
+fi
+
+# Output old ip
+
+ip=$(curl --silent 'https://ifconfig.co/' 2>&1)
+echo "Old IP: ${ip}"
+
+# Spoof mac address
+
+token=$(curl --silent "http://${gatewayip}/BAS_ether.htm" --user ${username}: 2>&1 | grep -o 'timestamp=[0-9]*' | sed 's/timestamp=//g')
+
+curl --silent "http://${gatewayip}/apply.cgi?/BAS_update.htm%20timestamp=${token}" --data 'submit_flag=ether&conflict_wanlan=&change_wan_type=1&run_test=no&ether_ipaddr=0.0.0.0&ether_subnet=0.0.0.0&ether_gateway=0.0.0.0&ether_dnsaddr1=8.8.8.8&ether_dnsaddr2=8.8.4.4&ether_dnsaddr3=&hid_mtu_value=1500&Apply=%C3%9Cbernehmen&loginreq=dhcp&system_name=WNDR3700v4&domain_name=&WANAssign=dhcp&DNSAssign=1&DAddr1=8&DAddr2=8&DAddr3=8&DAddr4=8&PDAddr1=8&PDAddr2=8&PDAddr3=4&PDAddr4=4&TDAddr1=&TDAddr2=&TDAddr3=&TDAddr4=&MACAssign=2&Spoofmac=5C%3AC4%3AA5%3A66%3A55%3A96' --user ${username}:${password} > /dev/null
+
+sleep 3
+
+# Renew connection
+
+token=$(curl --silent "http://${gatewayip}/RST_conn_status.htm" --user ${username}:${password} 2>&1 | grep -o 'timestamp=[0-9]*' | sed 's/timestamp=//g')
+
+curl --silent "http://${gatewayip}/apply.cgi?/RST_conn_status.htm%20timestamp=${token}" --data 'submit_flag=connect_status&endis_connect=3' --user ${username}:${password} > /dev/null
+
+sleep 10
+
+# Reset mac address
+
+token=$(curl --silent "http://${gatewayip}/BAS_ether.htm" --user ${username}:${password} 2>&1 | grep -o 'timestamp=[0-9]*' | sed 's/timestamp=//g')
+
+curl --silent "http://${gatewayip}/apply.cgi?/BAS_update.htm%20timestamp=${token}" --data 'submit_flag=ether&conflict_wanlan=&change_wan_type=1&run_test=no&ether_ipaddr=0.0.0.0&ether_subnet=0.0.0.0&ether_gateway=0.0.0.0&ether_dnsaddr1=8.8.8.8&ether_dnsaddr2=8.8.4.4&ether_dnsaddr3=&hid_mtu_value=1500&Apply=%C3%9Cbernehmen&loginreq=dhcp&system_name=WNDR3700v4&domain_name=&WANAssign=dhcp&DNSAssign=1&DAddr1=8&DAddr2=8&DAddr3=8&DAddr4=8&PDAddr1=8&PDAddr2=8&PDAddr3=4&PDAddr4=4&TDAddr1=&TDAddr2=&TDAddr3=&TDAddr4=&MACAssign=0' --user ${username}:${password} > /dev/null
+
+sleep 3
+
+# Renew connection
+
+token=$(curl --silent "http://${gatewayip}/RST_conn_status.htm" --user ${username}:${password} 2>&1 | grep -o 'timestamp=[0-9]*' | sed 's/timestamp=//g')
+
+curl --silent "http://${gatewayip}/apply.cgi?/RST_conn_status.htm%20timestamp=${token}" --data 'submit_flag=connect_status&endis_connect=3' --user ${username}:${password} > /dev/null
+
+sleep 10
+
+# Output new ip
+
+ip=$(curl --silent 'https://ifconfig.co/' 2>&1)
+echo "New IP: ${ip}"