| 7S (Prefix, Active), used by Bar 7S Performance Horses |
| * (Suffix, Active), used by Arcadia Quality Testing |
| 3C (Suffix, Active), used by Third Coast Warmbloods |
| =^^= (Both, Active), used by Mouse House Cattery |
| A ( Suffix, Active), used by Agent Acres |
| AC (Both, Active), used by Azure Cove Arabians |
| ACA (Prefix, Active), used by Azure Cove Arabians |
| AD ( Suffix, Retired), used by Amore Dressage, Inc. |
| ae (Prefix, Active), used by Anael Estate |
| AF (Suffix, Active), used by Aspandele Farms |
| AF (Suffix, Active), used by Amore Farms |
| Affinity (Both, Active), used by Affinity Incorporated |
| AK (Suffix, Active), used by Amore Kennels |
| Akmal (Both, Active), used by Akmal Arabians |
| ALF (Both, Active), used by American Legacy Farm |
| AM (Suffix, Active), used by Arista Manor |
| Andustar ( Prefix, Active), used by Andustar Kennels |
| Aphrael (Prefix, Active), used by Aphrael Stables |
| Atuan ( Prefix, Active), used by Atuan Arabians |
| Azure (Both, Active), used by Azure Cove Arabians |
| B ( Prefix, Retired), used by Blah Blah Acres |
| BA ( Suffix, Active), used by Beddingfield Arabians |
| BEC ( Prefix, Active), used by Brookdale Equestrian Center |
| BeQ (Prefix, Active), used by BiltEquine Stables |
| BFL (Prefix, Retired), used by Black Fox Ltd. |
| BT (Prefix, Active), used by Blackthorn Hills Farm |
| C (Suffix, Active), used by Camelot Canada |
| CA (Suffix, Active), used by Callabrook Arabians |
| CBSS ( Prefix, Active), used by Castle Brook Show Stables |
| CCI (Prefix, Active), used by Cold Creek Inc. |
| CdB (Both, Active), used by Chevaux de Boheme |
| CE (Prefix, Active), used by Cherrywood Estates |
| CH ( Suffix, Active), used by C&H Ranch |
| Chapel (Prefix, Active), used by Chapel Hill Arabians |
| CJT ( Prefix, Active), used by Crown Jewel Thoroughbreds |
| CNS (Prefix, Retired), used by CNSpots Appaloosas |
| CR (Prefix, Active), used by Chasing Rainbows |
| CS ( Prefix, Active), used by Continuum Stables |
| Dameer (Both, Active), used by Dameer Arabians |
| Dark Stone (Prefix, Active), used by Dark Stone Farms |
| Del (Prefix, Active), used by Del Ferrero Incorporated |
| DEq (Prefix, Active), used by Dorian Equestrian Center |
| DFA (Prefix, Retired), used by Showtime Stables |
| DSF (Prefix, Active), used by Diablioque Stud Farm |
| DT (Prefix, Active), used by Dreaming Tree Acres |
| DW (Prefix, Active), used by Dreamweaver Estate |
| ECC (Prefix, Retired), used by Equines And Canine Connection |
| Edenleigh (Prefix, Active), used by Edenleigh Equestrian |
| EE (Prefix, Active), used by Edenleigh Equestrian |
| EH ( Both, Retired), used by Elk Horn Ranch |
| EL (Both, Active), used by Everlast Inc |
| F (Suffix, Active), used by Falkferd Farm |
| FB (Prefix, Active), used by Firebrand Stables |
| FC (Prefix, Active), used by Flying Colors Racing |
| FC ( Both, Active), used by Fable Creek |
| from Misty Mirage (Suffix, Active), used by Misty Mirage |
| FS (Suffix, Active), used by Fiesta Stock Horses |
| Galal (Prefix, Active), used by Galal Arabians |
| GM (Prefix, Active), used by Golden Moments Ranch |
| GR (Suffix, Active), used by Glen Raven Arabians |
| GS (Prefix, Active), used by Godolphin Stables |
| H (Suffix, Active), used by Holkenstadt Stables |
| H (Suffix, Active), used by Heritage Egyptian Stud |
| Harmony's (Prefix, Active), used by Harmony Stables |
| HE (Both, Active), used by Haute Ecole |
| Heritage (Prefix, Active), used by Heritage Egyptian Stud |
| HH (Suffix, Active), used by Hollow Hearts Equestrain Center |
| HH (Prefix, Retired), used by Heritage Hills Arabians |
| HM ( Prefix, Active), used by Heritage Manor |
| Holkenstadt (Prefix, Active), used by Holkenstadt Stables |
| I-IV (Suffix, Active), used by Arcadia Verband |
| IA (Both, Active), used by Isis Egyptian Arabians Inc |
| IB (Prefix, Active), used by Irrational Brew |
| Ingalsin (Prefix, Active), used by Ingalsin |
| IRFI ( Prefix, Active), used by Indian Run Farm Inc. |
| ISS (Prefix, Active), used by Iron Spring Stables |
| ITF ( Prefix, Retired), used by Imagination Track Farms |
| JA (Suffix, Retired), used by Jugeotte Arabee |
| K ( Suffix, Retired), used by Kaspar Stables |
| KA (Suffix, Active), used by Kingsgate International |
| KC (Prefix, Retired), used by Kildeer Creek |
| Kildeer (Prefix, Retired), used by Kildeer Welsh Mountain Ponies |
| Kingsgate (Prefix, Active), used by Kingsgate International |
| L (Prefix, Active), used by Luxury Dog Kennels |
| Lazy Deer (Prefix, Active), used by Lazy Deer Ranch |
| LDR (Prefix, Active), used by Lazy Deer Ranch |
| Lillypuddles (Prefix, Active), used by Lillypuddles Kennel |
| Lipara (Prefix, Retired), used by WindKeeper Estates |
| LSF (Prefix, Retired), used by Long Shore Farms |
| M*D ( Both, Active), used by The Milton Diamond Stud (1) |
| MD ( Both, Active), used by The Milton Diamond Stud (2) |
| MDS ( Both, Active), used by The Milton Diamond Stud (3) |
| MH (Suffix, Active), used by Magnolia Hill |
| MK ( Suffix, Active), used by McFarland Krossing |
| MK (Prefix, Active), used by Mezzanotte Kennels |
| ML ( Prefix, Active), used by Renaissance Estates |
| MM ( Suffix, Active), used by Medieval Moments |
| Montefrio's ( Prefix, Active), used by Montefrio |
| Mor-Glo (Prefix, Active), used by Mor-Glo Meadows |
| MYS ( Prefix, Active), used by Mystic Visions |
| N (Suffix, Active), used by Norbound Stable |
| N ( Prefix, Retired), used by Nettlebrooke Farm |
| Narelle (Prefix, Active), used by Narelle Arabian Stud |
| NAS (Prefix, Active), used by Narelle Arabian Stud |
| Norbound (Prefix, Active), used by Norbound Stable |
| O (Both, Active), used by Oak Neereno |
| OA (Both, Active), used by Orthodox Arabians |
| of Snyder (Suffix, Active), used by Snyder Cyber Farms |
| P ( Prefix, Retired), used by Painted Moon Farms |
| PG (Suffix, Retired), used by Palisaede Gardens |
| PGi (Prefix, Retired), used by Palisaede Gardens Inc. |
| PR (Prefix, Active), used by Peppermint Ranch |
| PYR ( Prefix, Active), used by Midnight Valley Stables |
| R ( Suffix, Active), used by Rueath Acres |
| REX ( Prefix, Active), used by Silhouette |
| Rosewater (Both, Active), used by Rosewater Stud |
| Roundabout (Prefix, Active), used by Roundabout Farm |
| Royal (Prefix, Active), used by Royal Pond Morgans |
| Royalty Stables (Suffix, Active), used by Royalty Stables |
| RP (Suffix, Active), used by Rare Pearls Exotics |
| RRB (Suffix, Active), used by Roisin Stables |
| RS ( Prefix, Active), used by Royalty Stables |
| RS ( Prefix, Active), used by Rockstar Racing |
| RS (Prefix, Active), used by Regentaat Stud |
| Rs (Prefix, Active), used by Royal Estate Stud Farm |
| S (Suffix, Active), used by Sierra Stallion Station |
| S ( Prefix, Active), used by Southern Acres Inc |
| SA (Suffix, Active), used by Soleil Arabians |
| SAI (Prefix, Retired), used by Southern Acres Inc |
| Savvy (Prefix, Retired), used by Sporthorse Savvy Estates |
| SBF ( Prefix, Active), used by South Breeze Farm |
| SC (Prefix, Retired), used by Spirit Creek Stables |
| Seraphim (Prefix, Active), used by Seraphim Estates |
| Serendipity (Prefix, Active), used by Serendipity Farms Inc. |
| SF (Both, Active), used by Serendipity Farms Inc. |
| SFR (Prefix, Retired), used by Sim Friesian Registry |
| Showtime's ( Prefix, Active), used by Showtime Stables |
| SI (Prefix, Retired), used by Silmataurea International |
| Silverhawk (Prefix, Active), used by Silverhawk Morgans |
| Sirannon (Prefix, Active), used by Sirannon Kennels |
| SK ( Prefix, Active), used by Sonnenschein Kennels/Solare Kennels |
| SND ( Prefix, Retired), used by Spots N Dots Farm |
| South Breeze Farm's (Prefix, Active), used by South Breeze Farm |
| SR (Both, Active), used by Southern Rose Farm |
| SRF (Prefix, Active), used by Stoney Run Farms |
| SS (Prefix, Active), used by Showtime Stables |
| SS ( Prefix, Active), used by Starlight Stables, Inc. |
| SS ( Prefix, Active), used by Snap Shot Sporthorses |
| SSH (Both, Active), used by Serenity Sporthorses |
| SSR (Both, Active), used by Star Struck Ranch |
| SSS (Both, Active), used by Shining Stars Stables |
| Starlight's (Prefix, Active), used by Starlight Stables, Inc. |
| Steady (Prefix, Active), used by Steady Acres |
| Storyteller's ( Prefix, Active), used by Storyteller's stable & kennel |
| Subayai ( Prefix, Retired), used by Subayai |
| Suicid (Both, Active), used by Suicidal Hearts |
| SWF (Prefix, Retired), used by Spinning Wheel Farm |
| T (Suffix, Active), used by Atari International |
| T (Prefix, Active), used by Treasured Stables |
| TDI ( Prefix, Active), used by Tropicana Dreams Inc |
| Thistlebrook (Prefix, Retired), used by Thistlebrook Stables |
| TM (Prefix, Active), used by Two Moon Stables |
| TME ( Both, Active), used by The Matuchie Estate (in Horses Forever) |
| TS (Prefix, Active), used by Trillium Stables |
| V (Both, Active), used by Vanguard Friesians |
| Vanguard (Both, Active), used by Vanguard Friesians |
| VI (Suffix, Active), used by Vargas Inc. |
| Voienta (Prefix, Active), used by Voienta Farm |
| VS (Both, Retired), used by Valinor Shores |
| W (Prefix, Active), used by WindKeeper Estates |
| W$ ( Both, Active), used by Whistle Stop Farm |
| WA ( Prefix, Active), used by Windblown Arabians |
| WBS (Prefix, Active), used by Willow Brook Stables |
| Web's (Prefix, Retired), used by Spyder's Web |
| WEC (Prefix, Active), used by Watern Equestrian Center |
| WF (Suffix, Active), used by White Oleander Farm |
| WKE (Prefix, Active), used by WindKeeper Estates |
| WL (Suffix, Active), used by Weatherlord Farm |
| WLS (Prefix, Active), used by White Lion Stables |
| WS (Both, Retired), used by White Star Farms, Inc. |
| WT ( Prefix, Active), used by Windblown Thoroughbreds |
| WW (Prefix, Retired), used by WinterWood Paints |
| WW ( Prefix, Active), used by Windblown Warmbloods |
| z ( Suffix, Active), used by Zubayr Arabians |
| z Kuraz (Suffix, Active), used by Kuraz German Shepherd Dogs |
| ~~R~~ (Suffix, Active), used by Rock Hollow Farm |
| œ× ( Both, Active), used by Eureka Sim Game |
| «BE (Prefix, Active), used by Blue Equine Stables |