| Prefix | Organization | Purpose | Web Site | Contact | Registered |
|---|---|---|---|---|---|
| K | King Stairs Software | Reserved | www.kingstairs.com | M J Marshall | 21-Aug-1998 |
| K | Kemputer Pty Ltd | TKChessBoard | Colin Kemp | 04-Apr-1999 | |
| KA | KA Systems Technology | Kaxxx | kast.freeservers.com | Early Ehlinger | 24-Sep-1999 |
| KAD | Universal Interactive Inc | KADExec | www.universalsoftware.com | Keith Daigle | 06-Jul-1999 |
| kam | Kamiak Corp. | Kamiak ADO | www.kamiak.com | James Yegerlehner | 04-Sep-1999 |
| kamex | Kamiak Corp. | Kamiak Extensions | www.kamiak.com | James Yegerlehner | 04-Sep-1999 |
| kan | kanoop ltd | Reserved | www.kanoop.com | Niels Thomsen | 15-Sep-2000 |
| KAS | Reserved | priv.onet.pl/ld/hobbit | Krzysztof Swiatkowski | 27-May-1999 | |
| KBD | OzTel | TkbDShape | www.oztel.com | Francis Smit | 29-Oct-1999 |
| KBM | TkbmMemTable, TkbmPooledQuery, TkbmPooledStoredProc, TkbmPooledSession etc. | www.optical.dk | Kim Madsen | 21-Apr-1999 | |
| KCI | KCI | www.squareheaded.com | David Kempf | 04-Jun-2000 | |
| KDS | KD Soft Inc. | Reserved; Reserved | Karl Waclawek | 19-Mar-1999 | |
| KDZU | Reserved | www.pbe.com/Kudzu | Chad Hower | 25-Jul-1999 | |
| KEN | OttoSoft | reserved | www.ottosoft.com | Ken Otto | 04-Apr-1999 |
| Kes | KES Engineering service BV | All inhouse components | www.kers.nl | Mark van de Leur | 11-Aug-2000 |
| KGS | Krasimir Stoyanov | KGS Components; Tools | www.krasimir.com/Components.htm | Krasimir Stoyanov | 11-May-1998 |
| KHI | KHIRON Software Pty Ltd | Reserved | www.khiron.com | Richard Morris | 01-Feb-1999 |
| Kinetic | Kinetic Information System Services Ltd | Kinetic PortFolio; Financial market | www.kinetic.co.uk | Will Howliston | 10-Jul-1998 |
| KIO | Kioza Concept Design Inc. | Reserved | www.kioza.net | Jean-François Guay | 31-Oct-1999 |
| KJ | In Touch Computer Support | Reserved; Reserved | www.adam.com.au/kevinje | Kevin Jesshope | 05-May-1998 |
| KJRI | Kjell Rilbe | 16-Dec-1999 | |||
| KLM | KLM Computer Consulting | In-house components | Kerry Sanders | 03-Jan-2000 | |
| km | K and M Development | Mike McGuire | 08-Mar-2000 | ||
| KMJ | PHU KMJ | TKMJQuery | Krzysztof Jacewicz | 01-Sep-2000 | |
| kmr | Catalyst Systems | Ken Revak | 21-Apr-2002 | ||
| KNG | Kingetje | Reserved | Kingetje | 01-Jun-1999 | |
| KNO | David KNOBE | David KNOBE | 11-Oct-2004 | ||
| KNS | Koinos | Various | mns.co.za | Paul Niehaus | 21-Apr-1999 |
| Knw | Knowis, Inc. | KnowisFree Delphi Components | www.knowisinc.com | D Max Williams | 18-Nov-2015 |
| KNX | Koinos Informatica | Various | www.koinos.info | Paul Niehaus | 11-Sep-2003 |
| KOP | Toni Puhakka Ky | Inhouse components | www.tpky.fi | toni puhakka | 14-Dec-2007 |
| KP | Kalliopi International | KpSecurityGuard; Toolkit/Security | www.kalliopi.com | EJ Alexandra | 02-May-1998 |
| KPB | Klaus-Peter Buchhold | Reserved; Reserved | Klaus-Peter Buchhold | 06-Jun-1998 | |
| KPB | TKPBSwift | www.Buchhold.de | Klaus-Peter Buchhold | 09-Jul-1999 | |
| kpmg | KPMG Orinoco | Inhouse components | www.kpmg.com | Bert Taeymans | 10-Jun-2000 |
| KPT | Kemputer Pty Ltd | Reserved | Colin Kemp | 04-Apr-1999 | |
| KR | Kwik-Rite Development | ScramDisk; Disk Manage | www.kwikrite.clara.net | Andy Jeffries | 01-Feb-1999 |
| KRC | KRC Technologies, Inc. | www.engineering-software.com/ | Mike Stephenson | 12-Jul-2000 | |
| krp | ABF software, Inc. | krpRegions library and other K | www.ABFsoftware.com | KARPOLAN | 16-Sep-2001 |
| KRU | Michael Krupsdahl | Reserved | Michael Krupsdahl | 10-Aug-1999 | |
| KS | KHIRON Software Pty Ltd | Reserved; Reserved | www.khiron.com | Richard Morris | 10-May-1998 |
| ksw | Infomer | hobbit.republika.pl | Krzysztof Swiatkowski | 05-Feb-2002 | |
| ks_ | Insmart | Insmart Kick Start Utilities | www.insmart.com | Rod Grasso | 25-Sep-2000 |
| KT | Kerstin Thaler | KT Components; Toolkit | Kerstin Thaler | 15-May-1998 | |
| KTI | The Graphical Gnome | UDDF; GRAPHICS | www.gnomehome.demon.nl/uddf/index.htm | Rob den Braasem. | 28-Apr-1998 |
| KTS | GM Software | KTS Business Components | www.gmsoftware.com | Gilles Muys | 11-Jan-2000 |
| KUDZU | Chad Z. Hower | Reserved; Reserved | www.pbe.com/Kudzu | Chad Z. Hower | 04-Aug-1998 |
| kw | Keyware Systems, Inc. | POSWare | www.keywaresystems.com | Kirk Spadt | 02-Jan-2007 |
| kz | www.keyzero.com | Trevor Tippins | 07-Mar-2000 |