NAT Checker

Hall of Fame

Bug Hunters & Contributors

We can't test every router, ISP and operating system out there. You can. One email from Ilyes fixed the IPv6 test for everyone hitting the same bug - two days after he spotted the clue.(Psst - there's a bug loose on this page. Catch it three times.)

The Hall of Fame

1 hunter · slots open
I

Ilyes Kraïem

@laysson_boy

#001

Founding Bug Hunter

What they spotted
Noticed the IPv6 connectivity test failed on Windows but passed on Android - and that one wrote the address with "::" while the other used ":0:".
What it fixed
That clue exposed a bug where equivalent IPv6 address formats were treated as different, so valid connection candidates were discarded. Fixed and live two days later.
First BloodIPv6 WhispererRetested the fixOctober 2026

How one email became a fix

2 days from clue to fix

  1. Oct 7

    The clue

    Ilyes notices the IPv6 test passes on Android but fails on Windows - and that the two write the address differently.

  2. Oct 9

    The fix

    We confirm "::" and ":0:" were being treated as different addresses, dropping valid candidates. Fix ships.

  3. Oct 9

    The retest

    Ilyes runs the test again on the same Windows PC. Correct result.

  4. Now

    The card

    First name in the Hall of Fame, and a test that works for everyone who hit the same bug.

You see what we can't

We test on a handful of setups. Your router, ISP and operating system may be a combination we have never seen.

Half a sentence is enough

"Fails on Windows, passes on Android" was all it took last time. You don't need to know why it's broken.

A real person reads it

No ticket bots. If your report leads to a fix, you are the first to know - and your name can go up here.

What did you find?

Even "this looks weird" is useful. The draft already asks the right questions - just fill in what you know.

Preview your card

?Your name hereBug Hunter#002

Your email draft

Subject: [NAT Checker] Bug report

  • What did you do?
  • What did you expect to happen?
  • What happened instead? (a screenshot helps a lot)
  • Your browser and local time are pre-filled so we can reproduce it - delete them if you like.
Open email draft

Cards go up when a report leads to a change - and only with your OK, under the name you pick.