Check IP Tool
DynDNS offers a free web IP detection tool for use with DynDNS services. Check IP will return the remote socket's IP address. If a client sends a Client-IP or a X-Forwarded-For HTTP header, Check IP will return that value instead.
| Hostname: | checkip.dyndns.org |
|---|---|
| HTTP ports: | 80, 8245 |
Call and Answer
Check IP responds to valid HTTP requests for http://checkip.dyndns.com/. A valid request will result in the following sample response:
HTTP/1.1 200 OK
Content-Type: text/html
Server: DynDNS-CheckIP/1.0
Cache-Control: no-cache
Pragma: no-cache
Content-Length: 105
Connection: close
<html><head><title>Current IP Check</title></head><body>Current IP Address: 123.456.78.90</body></html>
Content-Type: text/html
Server: DynDNS-CheckIP/1.0
Cache-Control: no-cache
Pragma: no-cache
Content-Length: 105
Connection: close
<html><head><title>Current IP Check</title></head><body>Current IP Address: 123.456.78.90</body></html>
Policies
- Use the OS if possible for IP detection
- Checks must be spaced 10 minutes apart to help reduce server load
- In the case of an error while accessing Check IP, the client should not send an update