Which network is 78823 in United Kingdom?

This range is shared across prefixes: 73070, 73071, 73072, 73073, 73074, 73075, 73076, 73077, 73078, 73079, 73080, 73081, 73082, 73083, 73084, 73085, 73086, 73087, 73088, 73089, 73090, 73091, 73092, 73093, 73094, 73095, 73096, 73097, 73098, 73099, 73100, 73101, 73102, 73103, 73104, 73105, 73106, 73107, 73108, 73109, 73110, 73111, 73112, 73113, 73114, 73115, 73116, 73117, 73118, 73119, 73120, 73121, 73122, 73123, 73124, 73125, 73126, 73127, 73128, 73129, 73600, 73601, 73602, 73603, 73604, 73605, 73606, 73607, 73608, 73609, 73610, 73611, 73612, 73613, 73614, 73615, 73616, 73617, 73618, 73619, 73620, 73621, 73622, 73623, 73624, 73625, 73626, 73627, 73628, 73629, 73630, 73631, 73632, 73633, 73634, 73635, 73636, 73637, 73638, 73639, 73650, 73651, 73652, 73653, 73654, 73655, 73656, 73657, 73658, 73659, 73660, 73661, 73662, 73663, 73664, 73665, 73666, 73667, 73668, 73669, 73670, 73671, 73672, 73673, 73674, 73675, 73676, 73677, 73678, 73679, 73781, 73782, 73783, 73784, 73785, 73786, 73787, 73788, 73789, 73801, 73802, 73803, 73804, 73805, 73806, 73807, 73808, 73809, 73830, 73831, 73832, 73833, 73834, 73835, 73836, 73837, 73838, 73839, 73890, 73891, 73970, 73971, 73972, 73973, 73975, 73976, 73977, 73978, 73979, 74000, 74001, 74002, 74003, 74004, 74005, 74006, 74007, 74008, 74009, 74010, 74011, 74012, 74013, 74014, 74015, 74016, 74017, 74018, 74019, 74020, 74021, 74022, 74023, 74024, 74025, 74026, 74027, 74028, 74029, 74030, 74031, 74032, 74033, 74034, 74035, 74036, 74037, 74038, 74039, 74110, 74111, 74112, 74113, 74114, 74115, 74116, 74117, 74118, 74119, 74120, 74121, 74122, 74123, 74124, 74125, 74126, 74127, 74128, 74129, 74130, 74131, 74132, 74133, 74134, 74135, 74136, 74137, 74138, 74139, 74140, 74141, 74142, 74143, 74144, 74145, 74146, 74147, 74148, 74149, 74180, 74260, 74261, 74262, 74263, 74264, 74265, 74266, 74267, 74268, 74269, 74270, 74271, 74272, 74273, 74274, 74275, 74276, 74277, 74278, 74279, 74280, 74281, 74282, 74283, 74284, 74285, 74286, 74287, 74288, 74289, 74290, 74291, 74292, 74293, 74294, 74295, 74296, 74297, 74298, 74299, 74450, 74451, 74452, 74453, 74454, 74455, 74456, 74457, 74458, 74459, 74460, 74461, 74462, 74463, 74464, 74465, 74466, 74467, 74468, 74469, 74470, 74471, 74472, 74473, 74474, 74475, 74476, 74477, 74478, 74479, 74490, 74491, 74492, 74493, 74494, 74495, 74496, 74497, 74498, 74499, 74500, 74501, 74502, 74503, 74504, 74505, 74506, 74507, 74508, 74509, 74527, 74528, 74529, 74530, 74531, 74532, 74533, 74534, 74535, 74536, 74537, 74538, 74539, 74540, 74541, 74542, 74543, 74544, 74545, 74546, 74547, 74548, 74549, 74550, 74551, 74552, 74553, 74554, 74555, 74556, 74557, 74558, 74559, 74560, 74561, 74562, 74563, 74564, 74565, 74566, 74567, 74568, 74569, 74586, 74589, 74600, 74601, 74602, 74603, 74604, 74605, 74606, 74607, 74608, 74609, 74620, 74621, 74622, 74623, 74624, 74625, 74626, 74627, 74628, 74629, 74630, 74631, 74632, 74633, 74634, 74635, 74636, 74637, 74638, 74639, 74652, 74654, 74656, 74657, 74658, 74659, 74720, 74721, 74722, 74723, 74724, 74725, 74726, 74727, 74728, 74729, 74730, 74731, 74732, 74733, 74734, 74735, 74736, 74737, 74738, 74739, 74740, 74741, 74742, 74743, 74744, 74745, 74746, 74747, 74748, 74749, 74750, 74751, 74752, 74753, 74754, 74755, 74756, 74757, 74758, 74759, 74760, 74761, 74762, 74763, 74764, 74765, 74766, 74767, 74768, 74769, 74770, 74771, 74772, 74773, 74774, 74775, 74776, 74777, 74778, 74779, 74780, 74781, 74782, 74783, 74784, 74785, 74786, 74787, 74788, 74789, 74790, 74791, 74792, 74793, 74794, 74795, 74796, 74797, 74798, 74799, 74800, 74801, 74802, 74803, 74804, 74805, 74806, 74807, 74808, 74809, 74810, 74811, 74812, 74813, 74814, 74815, 74816, 74817, 74818, 74819, 74820, 74821, 74822, 74823, 74824, 74825, 74826, 74827, 74828, 74829, 74884, 74885, 74887, 74889, 74900, 74901, 74902, 74903, 74904, 74905, 74906, 74907, 74908, 74909, 74910, 74911, 74912, 74913, 74914, 74915, 74916, 74917, 74918, 74919, 74920, 74921, 74922, 74923, 74924, 74925, 74926, 74927, 74928, 74929, 75326, 75327, 75328, 75330, 75331, 75332, 75333, 75334, 75335, 75336, 75337, 75338, 75339, 75378, 75379, 75750, 75751, 75752, 75753, 75754, 75755, 75756, 75757, 75758, 75759, 75760, 75761, 75762, 75763, 75764, 75765, 75766, 75767, 75768, 75769, 75770, 75771, 75772, 75773, 75774, 75775, 75776, 75777, 75778, 75779, 75780, 75781, 75782, 75783, 75784, 75785, 75786, 75787, 75788, 75789, 75880, 75881, 75882, 75883, 75884, 75885, 75886, 75887, 75888, 75889, 77230, 77231, 77232, 77233, 77234, 77235, 77236, 77237, 77238, 77239, 77270, 77271, 77272, 77273, 77274, 77275, 77276, 77277, 77278, 77279, 77280, 77281, 77282, 77283, 77284, 77285, 77286, 77287, 77288, 77289, 77350, 77351, 77352, 77353, 77354, 77355, 77356, 77357, 77358, 77359, 77370, 77371, 77372, 77373, 77374, 77375, 77376, 77377, 77378, 77379, 77820, 77821, 77822, 77823, 77824, 77825, 77826, 77827, 77828, 77829, 78280, 78281, 78282, 78283, 78284, 78285, 78286, 78287, 78288, 78289, 78300, 78301, 78302, 78303, 78304, 78305, 78306, 78307, 78308, 78309, 78320, 78321, 78322, 78323, 78324, 78325, 78326, 78327, 78328, 78329, 78380, 78381, 78382, 78383, 78384, 78385, 78386, 78387, 78388, 78389, 78460, 78461, 78462, 78463, 78464, 78465, 78466, 78467, 78468, 78469, 78480, 78481, 78482, 78483, 78484, 78485, 78486, 78487, 78488, 78489, 78530, 78531, 78532, 78533, 78534, 78535, 78536, 78537, 78538, 78539, 78590, 78591, 78592, 78593, 78594, 78595, 78596, 78597, 78598, 78599, 78610, 78611, 78612, 78613, 78614, 78615, 78616, 78617, 78618, 78619, 78620, 78621, 78622, 78623, 78624, 78625, 78626, 78627, 78628, 78629, 78630, 78631, 78632, 78633, 78634, 78635, 78636, 78637, 78638, 78639, 78650, 78651, 78652, 78653, 78654, 78655, 78656, 78657, 78658, 78659, 78680, 78681, 78682, 78683, 78684, 78685, 78686, 78687, 78688, 78689, 78690, 78691, 78692, 78693, 78694, 78695, 78696, 78697, 78698, 78699, 78770, 78771, 78772, 78773, 78774, 78775, 78776, 78777, 78778, 78779, 78780, 78781, 78782, 78783, 78784, 78785, 78786, 78787, 78788, 78789, 78820, 78821, 78822, 78823, 78824, 78825, 78826, 78827, 78828, 78829, 78830, 78831, 78832, 78833, 78834, 78835, 78836, 78837, 78838, 78839, 78860, 78861, 78862, 78863, 78864, 78865, 78866, 78867, 78868, 78869, 78880, 78881, 78882, 78883, 78884, 78885, 78886, 78887, 78888, 78889, 78970, 78971, 78972, 78973, 78974, 78975, 78976, 78977, 78978, 78979, 78980, 78981, 78982, 78983, 78984, 78985, 78986, 78987, 78988, 78989, 79150, 79151, 79152, 79153, 79154, 79155, 79156, 79157, 79158, 79159, 79160, 79161, 79162, 79163, 79164, 79165, 79166, 79167, 79168, 79169, 79880, 79881, 79882, 79883, 79884, 79885, 79886, 79887, 79888, 79889