All users which currently have 100% on a site.
| Username | Site | First Track | Master since | Track-Time | From | |
|---|---|---|---|---|---|---|
 | 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% |
 | kmc0487 | Webhacking.kr | Mar 13, 2025 - 04:15:58 | Mar 13, 2025 - 04:15:58 | 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 | SuNiNaTaS | Oct 19, 2023 - 15:42:22 | Nov 25, 2023 - 11:19:00 | 36d 20h | 0.00% |
| 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% |
 | 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 | try to decrypt | Nov 15, 2017 - 15:40:10 | Nov 15, 2017 - 15:40:10 | 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% |
| 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 | RedTigers Hackit | Feb 23, 2017 - 20:48:33 | May 04, 2017 - 17:04:12 | 69d 19h | 0.00% |
| 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% |
| kwisatz | WeChall | Oct 13, 2011 - 15:36:12 | Mar 08, 2012 - 16:29:23 | 147d 1h | 0.28% |
| kwisatz | Security Override | Mar 11, 2012 - 16:29:46 | Mar 08, 2014 - 12:30:22 | 1y 361d | 0.00% |
| kwisatz | RedTigers Hackit | Mar 01, 2014 - 02:43:57 | Mar 01, 2014 - 03:03:58 | 20m 1s | 55.75% |
| kwisatz | IRISSCON 2012 Lost Challenges | Feb 28, 2014 - 23:33:35 | Mar 01, 2014 - 01:43:54 | 2h 10m | 0.00% |
| kwisatz | hax.tor.hu | Dec 18, 2011 - 22:52:34 | Dec 19, 2011 - 21:54:38 | 23h 2m | 16.00% |
| kwisatz | CSTutoringCenter | Dec 19, 2011 - 00:11:23 | Apr 11, 2012 - 15:21:49 | 114d 14h | 0.00% |
| kws981024 | LordofSQLi | May 29, 2020 - 11:17:25 | May 29, 2020 - 11:17:25 | 0s | 100.00% |
| k_s | CryptoHack | Jun 24, 2023 - 15:49:19 | Jun 24, 2023 - 15:49:19 | 0s | 100.00% |
| l0g | RedTigers Hackit | Mar 27, 2020 - 10:59:14 | Mar 31, 2020 - 07:31:39 | 3d 19h | 0.00% |
| L1S0n0Day | SuNiNaTaS | Apr 24, 2012 - 12:12:04 | Apr 24, 2012 - 12:12:04 | 0s | 100.00% |
| l3st3r | WeChall | Feb 04, 2018 - 23:32:21 | May 22, 2019 - 12:09:34 | 1y 106d | 1.26% |
 | LACiA | Webhacking.kr | Mar 28, 2024 - 10:28:07 | Apr 10, 2024 - 13:34:46 | 13d 2h | 0.00% |
| LACiA | SuNiNaTaS | Mar 28, 2024 - 10:46:22 | Mar 28, 2024 - 10:46:22 | 0s | 100.00% |
| LACiA | RedTigers Hackit | Mar 28, 2024 - 11:25:05 | Mar 28, 2024 - 11:25:05 | 0s | 100.00% |
 | lavish | RedTigers Hackit | Jul 21, 2013 - 01:26:19 | Jul 23, 2013 - 02:56:35 | 2d 1h | 2.17% |
| lavish | HackThisSite | Apr 05, 2023 - 20:33:22 | Apr 05, 2023 - 20:33:22 | 0s | 100.00% |
| laxa | RedTigers Hackit | Jun 30, 2016 - 19:51:04 | Jul 22, 2016 - 00:54:40 | 21d 5h | 0.00% |
 | Lays | pwnable.kr | Jan 27, 2016 - 13:36:28 | Mar 18, 2016 - 15:56:17 | 51d 2h | 36.16% |
 | lazyidiot | hax.tor.hu | Sep 23, 2009 - 18:28:02 | Oct 29, 2009 - 05:37:04 | 35d 12h | 20.00% |
| LeaveRet | Mathchall | Dec 27, 2013 - 16:34:44 | Jan 04, 2014 - 21:51:49 | 8d 5h | 0.00% |
| LeGiON | hax.tor.hu | May 11, 2009 - 11:18:45 | Jan 29, 2012 - 17:29:34 | 2y 263d | 98.00% |
| leom | Hacker Gateway | Jul 25, 2018 - 18:26:53 | Jul 25, 2018 - 18:26:53 | 0s | 100.00% |
| leom | ae27ff | Aug 01, 2017 - 00:03:17 | Aug 15, 2017 - 02:52:39 | 14d 2h | 76.32% |
 | lia_v | try to decrypt | Feb 27, 2019 - 00:58:36 | Mar 14, 2019 - 21:12:15 | 15d 20h | 92.86% |
| limelee85 | LordofSQLi | Dec 24, 2019 - 09:19:52 | Dec 24, 2019 - 09:19:52 | 0s | 100.00% |
 | limiao | RedTigers Hackit | Jul 26, 2018 - 08:36:03 | Oct 18, 2018 - 15:09:46 | 84d 6h | 2.17% |