About PPORT
PPORT offers network tools and guides that show where to look first when a port will not open or a domain or certificate does not behave as expected.
PPORT ·
Why PPORT exists
When you expose a NAS, game server or home server to the internet, a result that only says “port closed” does not tell you whether to fix the program, the firewall, the router or the ISP. PPORT pairs each check result with the next place to look and the commands to run there.
Results labelled “Measured output” in the guides were captured on the PPORT production server and on the operator’s PC.
What you can use
- Port check: tests whether one TCP port on the public IP you are connecting from is reachable from the internet.
- Lookups: your IP and User-Agent, DNS, reverse DNS, WHOIS, SSL certificates, and HTTP headers and status codes, queried from the PPORT server.
- Browser tools: subnet calculation, Base64, URL encoding, JSON formatting, timestamps, hashes, UUIDs, character counts and Punycode run in your browser without sending your input to the server.
- Guides: port diagnosis, port forwarding, DNS record types, SSL certificates, HTTP status codes, private IP ranges and well-known ports.
Limits that keep it safe
The port check only targets the public IP you are connecting from and tests one TCP port at a time. PPORT cannot check other people’s servers or sweep ranges of ports. By default, network tool requests from one public IP are limited to 30 per hour.
Use the lookup tools only on targets you manage or are authorized to diagnose. Results reflect what the PPORT server saw at query time, and repeated lookups may show a cached result for up to six hours.
How the guides are written
Commands and explanations are checked against official sources such as Microsoft documentation, Linux man pages and IETF RFCs, which are listed at the bottom of each page. Results labelled “Measured output” come from a real run; unlabelled output is an example that shows the format.
Where PPORT cannot see from the outside, such as router settings or ISP filtering, the guides do not guess. They explain how to check it yourself.
Languages
PPORT is written in Korean and the same content is provided in English. Translations whose accuracy cannot be checked are not published; another language will be added only after a reviewed translation is ready.
On your first visit PPORT follows your browser language (English unless it is Korean), and a language you pick at the top is remembered for later visits. Your input, raw lookup results, commands and code examples are never translated.
Advertising and privacy
PPORT shows Google AdSense ads to cover running costs. Ads do not affect tool results or usage limits. Advertising cookies and how to turn off personalized ads are explained in the privacy policy.
Tool usage statistics are recorded with pseudonymized IP addresses, and input to the browser tools is not stored. There is no user registration.
Contact and corrections
Send errors, incorrect explanations or lookup exclusion requests to pport.cloud@gmail.com or post them on the board. Including the page address, your environment, the result you expected and the result you got helps us check quickly. Do not send passwords, tokens or personal data.