All users which currently have 100% on a site.
| Username | Site | First Track | Master since | Track-Time | From | |
|---|---|---|---|---|---|---|
 | kagure | RedTigers Hackit | Jan 26, 2019 - 21:23:12 | Mar 02, 2023 - 21:51:18 | 4y 36d | 0.00% |
| kanade | HackThisSite | Jun 15, 2014 - 13:01:05 | Jun 15, 2014 - 13:01:05 | 0s | 100.00% |
 | Karrax | RedTigers Hackit | Dec 06, 2018 - 18:44:51 | Dec 18, 2018 - 00:28:55 | 11d 5h | 0.00% |
 | kasia-tutej | RedTigers Hackit | Aug 30, 2016 - 16:18:00 | Aug 30, 2016 - 16:31:57 | 13m 57s | 0.00% |
 | kazenojiyu | RedTigers Hackit | Jul 02, 2016 - 20:23:27 | Jul 02, 2016 - 20:28:52 | 5m 25s | 0.00% |
| kazetkazet | RedTigers Hackit | Sep 25, 2016 - 15:27:43 | Sep 25, 2016 - 17:01:12 | 1h 33m | 2.17% |
| kazetkazet | hax.tor.hu | Sep 20, 2016 - 19:07:26 | Mar 15, 2017 - 17:05:01 | 175d 22h | 4.00% |
| kazetkazet | hackburger | Oct 23, 2017 - 17:35:27 | Oct 23, 2017 - 17:35:27 | 0s | 100.00% |
 | KazWolfe | ae27ff | Aug 28, 2019 - 06:04:01 | Aug 28, 2019 - 06:04:01 | 0s | 100.00% |
 | kcats | SuNiNaTaS | Jul 03, 2014 - 18:34:39 | Jul 29, 2014 - 11:02:49 | 25d 16h | 66.87% |
| KCJones | RedTigers Hackit | May 23, 2016 - 03:15:38 | May 23, 2016 - 10:17:28 | 7h 1m | 0.00% |
 | Kender | HackQuest | Mar 13, 2008 - 20:26:32 | Mar 13, 2008 - 20:26:32 | 0s | 100.00% |
| Kender | Electrica | Feb 02, 2009 - 15:10:16 | May 30, 2009 - 09:23:00 | 116d 17h | 36.36% |
| Kender | +Ma's Reversing | Feb 28, 2009 - 23:59:57 | May 04, 2009 - 18:23:27 | 64d 17h | 50.00% |
| Kender | hax.tor.hu | Jun 01, 2009 - 12:40:09 | Jun 02, 2009 - 20:11:14 | 1d 7h | 26.00% |
 | kepten | Gekkó | Aug 25, 2011 - 15:16:53 | Jul 17, 2013 - 13:15:06 | 1y 326d | 47.62% |
| kepten | HackThisSite | Nov 15, 2010 - 16:16:11 | Jan 27, 2021 - 22:58:15 | 10y 76d | 57.31% |
 | kernelpanic | +Ma's Reversing | Dec 29, 2018 - 23:59:18 | Dec 29, 2018 - 23:59:18 | 0s | 100.00% |
| kev1 | HackBBS | Aug 13, 2010 - 22:35:33 | Jan 04, 2013 - 17:28:51 | 2y 144d | 81.08% |
| kev1 | RedTigers Hackit | Dec 12, 2013 - 10:19:07 | Dec 26, 2013 - 09:58:15 | 13d 23h | 8.68% |
| kev1 | HackThisSite | Apr 07, 2010 - 20:45:35 | Apr 05, 2023 - 20:31:09 | 13y 23h | 5.58% |
| kevinhyun | SuNiNaTaS | May 08, 2014 - 06:10:42 | May 14, 2014 - 10:47:36 | 6d 4h | 6.91% |
 | kiam | SuNiNaTaS | May 08, 2020 - 08:32:33 | May 14, 2020 - 12:52:50 | 6d 4h | 0.00% |
 | kijibwa | HackThisSite | Apr 06, 2010 - 05:07:43 | Jan 16, 2021 - 03:08:28 | 10y 287d | 95.53% |
| KimTruth | SuNiNaTaS | Aug 09, 2014 - 13:54:37 | Dec 20, 2014 - 09:50:51 | 132d 20h | 3.71% |
 | kingpbz | RedTigers Hackit | Apr 19, 2018 - 11:19:51 | Apr 23, 2018 - 11:25:28 | 4d 5m | 0.00% |
| kismet | RedTigers Hackit | May 22, 2013 - 21:05:48 | Jun 20, 2016 - 22:35:30 | 3y 30d | 0.00% |
| kismet | hax.tor.hu | Dec 01, 2011 - 17:33:12 | Jan 28, 2017 - 05:49:23 | 5y 59d | 2.00% |
| kitchan | HackThisSite | Aug 30, 2009 - 06:57:05 | Apr 05, 2023 - 20:30:38 | 13y 221d | 68.81% |
| kithyane | CSTutoringCenter | Jan 10, 2011 - 18:32:07 | Feb 08, 2011 - 21:34:07 | 29d 3h | 0.00% |
| kkaddol | SuNiNaTaS | Sep 17, 2020 - 03:13:23 | Sep 17, 2020 - 03:13:23 | 0s | 100.00% |
| KnightChaser | SuNiNaTaS | Oct 08, 2023 - 15:05:29 | Oct 15, 2023 - 12:59:31 | 6d 21h | 70.75% |
| KnightKoroviev | Reversing.Kr | Feb 21, 2014 - 22:01:23 | Apr 28, 2014 - 00:01:28 | 65d 1h | 0.00% |
| KnightKoroviev | RedTigers Hackit | Oct 02, 2014 - 21:10:03 | Oct 07, 2014 - 18:12:14 | 4d 21h | 2.17% |
| koma | Root-Me | Oct 23, 2011 - 00:38:37 | Feb 10, 2012 - 16:37:20 | 110d 16h | 74.40% |
 | kompel | RedTigers Hackit | Mar 19, 2021 - 22:49:53 | Jul 29, 2021 - 10:16:07 | 131d 10h | 0.00% |
| kompel | LordofSQLi | Mar 18, 2021 - 23:31:09 | Aug 23, 2021 - 15:53:40 | 157d 15h | 4.08% |
| kompel | SuNiNaTaS | Oct 19, 2023 - 15:42:22 | Nov 25, 2023 - 11:19:00 | 36d 20h | 0.00% |
 | Kot | hax.tor.hu | Aug 21, 2009 - 20:57:34 | Aug 21, 2009 - 20:57:34 | 0s | 100.00% |
| KSHMK | Reversing.Kr | Jan 12, 2017 - 00:23:40 | Jan 12, 2017 - 00:23:40 | 0s | 100.00% |
| ksisyn | HackThisSite | Jul 27, 2017 - 01:53:14 | Apr 05, 2023 - 20:38:21 | 5y 253d | 82.20% |
| ksydfius | RedTigers Hackit | Nov 24, 2013 - 21:08:38 | Nov 24, 2013 - 22:38:05 | 1h 29m | 0.00% |
| ksydfius | HackThisSite | Apr 05, 2023 - 20:32:27 | Apr 05, 2023 - 20:32:27 | 0s | 100.00% |
 | kumaus | RedTigers Hackit | Nov 19, 2015 - 21:40:17 | Nov 25, 2015 - 11:51:36 | 5d 14h | 0.00% |
| kumaus | Hacker Gateway | Mar 28, 2017 - 16:44:52 | Apr 03, 2017 - 14:33:32 | 5d 21h | 65.22% |
| kumaus | try to decrypt | Nov 15, 2017 - 15:40:10 | Nov 15, 2017 - 15:40:10 | 0s | 100.00% |
| kuroneko | RedTigers Hackit | Apr 30, 2016 - 09:42:48 | Oct 16, 2016 - 09:10:13 | 168d 23h | 0.00% |
| kuroneko | LordofSQLi | Sep 09, 2019 - 14:19:22 | Sep 09, 2019 - 14:19:22 | 0s | 100.00% |
| kwapik | hax.tor.hu | Jun 17, 2016 - 18:43:24 | Feb 20, 2017 - 22:32:52 | 248d 4h | 2.00% |
| kwapik | Hacker Gateway | Apr 05, 2017 - 19:20:15 | Apr 19, 2017 - 19:26:35 | 14d 6m | 78.26% |