While doing the new Item Restoration service I found the following realms hidden in the "View all realms" link.
Some may allude to future content for you detective types.
"A'dal","Ahune","Aimee's Development Server","Akil'zon","Al'Akir","Alex's Server","Anasterian (US)","Antonidas","Arcurion (Português)","Arena Tournament 1","Arena Tournament 1","Arena Tournament 1","Arena Tournament 1","Arena Tournament 10","Arena Tournament 12","Arena Tournament 13","Arena Tournament 14","Arena Tournament 15","Arena Tournament 16","Arena Tournament 2","Arena Tournament 2","Arena Tournament 2","Arena Tournament 3","Arena Tournament 3","Arena Tournament 3","Arena Tournament 3","Arena Tournament 4","Arena Tournament 4","Arena Tournament 5","Arena Tournament 5","Arena Tournament 6","Arena Tournament 6","Arena Tournament 7","Arena Tournament 7","Arena Tournament 8","Arena Tournament 8","Arena Tournament 9","Aszune","Atlas 22","Atuik","Auchindoun","Auchindoun","Azralon","Azuremyst","BETA EU CSI 83","BETA REGIONAL 71","BETA US CSBG 92","BETA US CSI 82","Battle net Invitational","Battle.net D3 QA","Battle.net QA","Battle.net SC2 QA","Battle.net WoW QA","Benedictus","Black Temple","Black Temple","Black Tooth Grin","Blackmoore","BlizzCon Event","BlizzCon Event CSBG 96","BlizzCon Realm 1","BlizzCon Realm 10","BlizzCon Realm 2","BlizzCon Realm 3","BlizzCon Realm 4","BlizzCon Realm 5","BlizzCon Realm 6","BlizzCon Realm 7","BlizzCon Realm 8","BlizzCon Realm 9","Blizzcon Arena Tournament","Bloodhoof","Brainchewer","Breezy Kilt","Brill (EU)","Broxigar (US)","BubbaHoTep","C-CLASS Test 1","C-CLASS Test 2","C-CLASS Test 3","C-CLASS Test 4","CN Test Live 17","CN10A-BG","CN10A1-INST","CN10A2-INST","CN10B-BG","CN10B1-INST","CN10B2-INST","CN11A-CSBG","CN11A-INST","CN11A2-INST","CN1A-BG","CN1A1-INST","CN1A2-INST","CN1B-BG","CN1B1-INST","CN1B2-INST","CN2A-BG","CN2A1-INST","CN2A2-INST","CN2B-BG","CN2B1-INST","CN2B2-INST","CN3A-BG","CN3A1-INST","CN3A2-INST","CN3B-BG","CN3B1-INST","CN3B2-INST","CN4A-BG","CN4A1-INST","CN4A2-INST","CN4B-BG","CN4B1-INST","CN4B2-INST","CN5A-BG","CN5A1-INST","CN5A2-INST","CN5B-BG","CN5B1-INST","CN5B2-INST","CN6A-BG","CN6A1-INST","CN6A2-INST","CN6B-BG","CN6B1-INST","CN6B2-INST","CN7A-BG","CN7A1-INST","CN7A2-INST","CN7B1-INST","CN7B2-INST","CN7b-BG","CN8A-BG","CN8A1-INST","CN8A2-INST","CN8B-BG","CN8B1-INST","CN8B2-INST","CN9A-BG","CN9A1-INST","CN9A2-INST","CN9B-BG","CN9B1-INST","CN9B2-INST","CS Training Realm","CS Training Realm","CS Training Realm","Caelestrasz","Championship Gaming Series","Coliseum 1","Coliseum 1","Coliseum 2","Coliseum 2","College Gaming League","Compatland","Craig's Server","Craig's test RDB","Dargonax","Deadwind Pass","Deathweaver","Dev CS Realm 1","Dev CS Realm 2","Dev CSBG","Dev WoW Monitor","Dihydrogen Monoxide","Doomhammer","Draenor","Dreamhack","Dunemaul","EU Arena Pass CSBG","EU Arena Pass CSBG","EU1A-BG","EU1A1-INST","EU1A2-INST","EU1B-BG","EU1B1-INST","EU1B2-INST","EU2A-BG","EU2A1-INST","EU2A2-INST","EU2B-BG","EU2B1-INST","EU2B2-INST","EU3A-BG","EU3A1-INST","EU3A2-INST","EU3B-BG","EU3B1-INST","EU3B2-INST","EU4A-BG","EU4A1-INST","EU4A2-INST","EU4B-BG","EU4B1-INST","EU4B2-INST","EU5A-BG","EU5A1-INST","EU5A2-INST","EU5B-BG","EU5B1-INST","EU5B2-INST","EU6A-BG","EU6A1-INST","EU6A2-INST","EU6B-BG","EU6B1-INST","EU6B2-INST","EU7A-BG","EU7A-BG-RU","EU7A1-INST","EU7A2-INST","EU7B-BG","EU7B-BG-RU","EU7B1-INST","EU7B2-INST","Electronic Sports League","Electronic Sports League","Elune","Erudax","Erudax","Euskal Encounter","Event Realm 1","Event Realm 2","Event Realm 2","Event Realm 3","Event Realm 4","Eventos 1","Eventos 2","Events 1","Expansion QA CSBG 98","Expansion QA CSI 88","Expansion Test 23","Expansion Test 24","Expansion Test 25","Expansion Test 26","Expansion Test 27","Expansion Test 28","Expansion Test CSBG 97","Expansion Test CSI 87","Fizzcrank","Fordring","Frozen Throne","GM Test","GM Test realm","GM Test realm 2","GMSupport KR1-01","GMSupport KR1-02","GMSupport SU1-02","GMSupport SU1-03","GMSupport SU1-04","GMSupport SU1-05","GMSupport SU5-01","GMSupport SU5-02","GMSupport SU5-03","GMSupport SU9-01","GMSupport SU9-02","GMSupport SU9-03","GMSupport SU9-04","GMSupport SU9-05","GMSupport TW2-01","GMSupport TW2-02","GMSupport TW2-03","GMSupport TW2-04","GMSupportDEVOT","GMSupportDEVOT2","GMSupportDEVOT3","GMSupportDEVOT4","GMSupportDEVOT 5","GMSupportDEVOT6","GMSupportDEVOT7","GMSupportDEVOT8","GMSupportPTR Beta","GMSupportPTR PTR","GMSupportPTR QA","GMSupportPTR QA","GMSupportPTR QA ","GMSupportPTR QA2","Galakrond","Gallywix","Gamescom","Gilneas (US)","Glacierthief","Gnomeregan","Goodman's Gazebo","Grizzlyhügel","Halazzi","Hamuul (KR)","IgroMir 1","IgroMir 2","Jan'alai","Jesse's Source Server","Jesse's Source Server 2","Jesse's Target Server","Jesse's Target Server 2","John's World","KR Event Realm 1","KR Event Realm 2","KR Event Realm 3","KR Event Realm 4","KR Event Realm 6","KR Event Realm 7","KR Event Realm 8","KR Event Realm 9","KR Internal Test","KR1A-BG","KR1A1-INST","KR1A2-INST","KR1B-BG","KR1B1-INST","KR1B2-INST","KR2A-BG","KR2A1-INST","KR2A2-INST","KR2B-BG","KR2B1-INST","KR2B2-INST","Kael'thas","Kalaran","Kalithresh","Kaz'rogal","Korth'azz","Kramerica","Kyle's Realm","Lana'thel","Land of Joe","Legion Hold","Legion's Fate","Leotheras","Lich King","Live Hotfix 11","Live Hotfix 12","Live Hotfix CSBG 93","Live Hotfix CSI","LocTest 1","Lost Isles (US)","Lycanthoth","Mafia Server","Major League Gaming","Malacrass","Maladaar","Mekkatorque (EU)","Menethil","Merithra","Michael Skacal-0.0.0.0","Mo'grosh","Mo'grosh","Moltron","Moltron","Mordis","Moroes","Mount Doom","Muradin","Muradin","Naj'entus","Nalorakk","Naralex (EU)","Nathrezim","Naxxramas","Naz'jar","Nazan","Nefarian","Neltharion","Nemesis","Netheku rse","Nobundo (KR)","Offlimits","Old_Blackmoore","Old_Cenarius","Old_Deathwing","Old_Eonar","Old_Hyjal", "Old_Karazhan","Old_Kul Tiras","Old_Llane","Old_Rexxar","Old_Stormrage","Old_Wildhammer","Old_Zul'jin","Omar's Secret CSINST","Omar's Secret Fort","Online Tech 1","Online Tech 10","Online Tech 11","Online Tech 12","Online Tech 13","Online Tech 14","Online Tech 2","Online Tech 26","Online Tech 27","Online Tech 28","Online Tech 29","Online Tech 30","Online Tech 31","Online Tech 32","Online Tech 33","Online Tech 4","Online Tech 5","Online Tech 6","Online Tech 7","Online Tech 9","Online Tech WebRealm 95","Online Tech WebRealm 96","Online Test Realm 1","Online Test Realm 2","Online Test Realm 3","Ozumat","PTR EU CSBG 91","PTR EU KR CSI 81","PTR US CSBG 90","PTR US CSI 80","PTR WEB 72","PTR WoW Monitor","Pathaleon","Penguin 1","Penguin 2","Plaguelands","Programming Server","QA CSBG and CSI 80","QA Casa de Flo","QA Engineering Server","QA GM Support 190","QA Internal 01","QA Internal 02","QA Internal 03","QA Internal 04","QA Internal 05","QA Regional 89","QA Server","QA Smoke Test","QA Standby 97","QA Standby 98","QA TAR 19","QA Templates","QA Test 15","QA Test 16","QA Test CSBG 95","QA Test CSI 86","QA Upgrade 13","QA Upgrade 14","QA Upgrade CSBG 94","QA Upgrade CSI 85","QA Upper Blackrock","QA Web 95","RDB CN","RDB EU","RDB KR","RDB TW","RDB US","Rajaxx","Rask","Realm 0","Realm21","Realm22","Realm23","Realm24","Realm45","Realm46","Realm47","Realm48","Rehgar ","Roanauk","Ron Nakada-0.0.0.0","Ron's CSBG","SC2 QA WoW Desktop","Sacrolash","Sam's Happy Funland","Sandfury","Sathrovarr","Schwarznarbe","Serbalicious World","Server Id 0 DEV","Sethria","Silvermarsh","Slabhide","Spinethief","Spirit Rock","Sun Rock Retreat","Sylvanas","T2 Playtest","T2 Playtest CSI","TW2A-BG","TW2A1-INST","TW2A2-INST","TW2B-BG","TW2B1-INST","TW2B2-INST","TW3A-BG","TW3A1-INST","TW3A2-INST","Taerar","Tarren Mill","Team 2 Server","Tempest Keep","Teremus","The Arcatraz","The Botanica","The Mechanar","The Underbelly","The Wrong Server","Theradras","Theralion","Tigole's Raidcraft","Tol Barad","Tol Barad","Tournament Realm 2","Twin Peaks","Tyranastrasz","Tyrus Blackhorn","Tyrygosa","US Event Realm 2","US Event Realm 3","US Event Realm 4","US Event Realm 5","US Event Realm 7","US Event Realm 8","US GM TEST","US PTR REGIONAL 70","US1A-BG","US1A1-INST","US1A2-INST","US1B-BG","US1B1-INST","US1B2-INST","US2A-BG","US2A1-INST","US2A2-INST","US2B-BG","US2B1-INST","US2B2-INST","US3A-BG","US3A1-INST","US3A2-INST","US3B-BG","US3B1-INST","US3B2-INST","US4A-BG","US4A1-INST","US4A2-INST","US4B-BG","US4B1-INST","US4B2-INST","US5A-BG","US5A1-INST","US5A2-INST","US5B-BG","US5B1-INST","US5B2-INST","US6A-BG","US6A1-INST","US6A2-INST","US6B-BG","US6B1-INST","US6B2-INST","US7A-BG","US7A1-INST","US7A2-INST","US7A2-INST","US7B-BG","US7B1-INST","US7B2-INST","US8A1-INST","US8A2-INST","US8B1-INST","US8B2-INST","Ulduar","Ulduar","Ulthok","Umbriss","Valanar","Valanar","Valiona","Varedis","Vazrud en","Vol'jin","Vorpil","WWI Backup 1","WWI Backup 2","WWI Community Tournament","WWI Invitational Tournament","WWI Live Raid","Web Server 73","Web Server 74","Webrealm","Webrealm","Webrealm","Webrealm","Webrealm","Webrealm","Webrealm","Webrealm ","Webrealm","Webrealm","Webrealm","Webrealm","Webrealm","Webrealm","Webrealm","Webrealm", "Webrealm","Webrealm","Webrealm","Webrealm","Webrealm","Webrealm","Webrealm","Webrealm","W ebrealm","Webrealm","Webrealm","Webrealm","Webrealm","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm 2","Webrealm2","Webrealm2","Winterchill","Winterhuf","Witherbark","Wolf's Run","World of Warden","XSInst A","XSInst B","XSInst C","Xavius","Xavius","Xaxas","Zar'jira","Zin-Azshari","Zul'Drak","kmccath-realm","nnoble-csi","nnoble-realm","nnoble-realm2","nnoble-regional","patrick.dawson-0.0.0.0","zzz_RDB EU","Évènements 2"