This page contains information about which telephone companies the various 02310 numbers are allocated to.
| First Digits | Status | Number Length |
|---|---|---|
| 023 1000 | Free for National Dialling Only | (0)+10 |
| 023 1001 | Free for National Dialling Only | (0)+10 |
| 023 1002 | Free for National Dialling Only | (0)+10 |
| 023 1003 | Free for National Dialling Only | (0)+10 |
| 023 1004 | Free for National Dialling Only | (0)+10 |
| 023 1005 | Free for National Dialling Only | (0)+10 |
| 023 1006 | Free for National Dialling Only | (0)+10 |
| 023 1007 | Free for National Dialling Only | (0)+10 |
| 023 1008 | Free for National Dialling Only | (0)+10 |
| 023 1009 | Free for National Dialling Only | (0)+10 |
| 023 1010 | Free for National Dialling Only | (0)+10 |
| 023 1011 | Free for National Dialling Only | (0)+10 |
| 023 1012 | Free for National Dialling Only | (0)+10 |
| 023 1013 | Free for National Dialling Only | (0)+10 |
| 023 1014 | Free for National Dialling Only | (0)+10 |
| 023 1015 | Free for National Dialling Only | (0)+10 |
| 023 1016 | Free for National Dialling Only | (0)+10 |
| 023 1017 | Free for National Dialling Only | (0)+10 |
| 023 1018 | Free for National Dialling Only | (0)+10 |
| 023 1019 | Free for National Dialling Only | (0)+10 |
| 023 1020 | Free for National Dialling Only | (0)+10 |
| 023 1021 | Free for National Dialling Only | (0)+10 |
| 023 1022 | Free for National Dialling Only | (0)+10 |
| 023 1023 | Free for National Dialling Only | (0)+10 |
| 023 1024 | Free for National Dialling Only | (0)+10 |
| 023 1025 | Free for National Dialling Only | (0)+10 |
| 023 1026 | Free for National Dialling Only | (0)+10 |
| 023 1027 | Free for National Dialling Only | (0)+10 |
| 023 1028 | Free for National Dialling Only | (0)+10 |
| 023 1029 | Free for National Dialling Only | (0)+10 |
| 023 1030 | Free for National Dialling Only | (0)+10 |
| 023 1031 | Free for National Dialling Only | (0)+10 |
| 023 1032 | Free for National Dialling Only | (0)+10 |
| 023 1033 | Free for National Dialling Only | (0)+10 |
| 023 1034 | Free for National Dialling Only | (0)+10 |
| 023 1035 | Free for National Dialling Only | (0)+10 |
| 023 1036 | Free for National Dialling Only | (0)+10 |
| 023 1037 | Free for National Dialling Only | (0)+10 |
| 023 1038 | Free for National Dialling Only | (0)+10 |
| 023 1039 | Free for National Dialling Only | (0)+10 |
| 023 1040 | Free for National Dialling Only | (0)+10 |
| 023 1041 | Free for National Dialling Only | (0)+10 |
| 023 1042 | Free for National Dialling Only | (0)+10 |
| 023 1043 | Free for National Dialling Only | (0)+10 |
| 023 1044 | Free for National Dialling Only | (0)+10 |
| 023 1045 | Free for National Dialling Only | (0)+10 |
| 023 1046 | Free for National Dialling Only | (0)+10 |
| 023 1047 | Free for National Dialling Only | (0)+10 |
| 023 1048 | Free for National Dialling Only | (0)+10 |
| 023 1049 | Free for National Dialling Only | (0)+10 |
| 023 1050 | Free for National Dialling Only | (0)+10 |
| 023 1051 | Free for National Dialling Only | (0)+10 |
| 023 1052 | Free for National Dialling Only | (0)+10 |
| 023 1053 | Free for National Dialling Only | (0)+10 |
| 023 1054 | Free for National Dialling Only | (0)+10 |
| 023 1055 | Free for National Dialling Only | (0)+10 |
| 023 1056 | Free for National Dialling Only | (0)+10 |
| 023 1057 | Free for National Dialling Only | (0)+10 |
| 023 1058 | Free for National Dialling Only | (0)+10 |
| 023 1059 | Free for National Dialling Only | (0)+10 |
| 023 1060 | Free for National Dialling Only | (0)+10 |
| 023 1061 | Free for National Dialling Only | (0)+10 |
| 023 1062 | Free for National Dialling Only | (0)+10 |
| 023 1063 | Free for National Dialling Only | (0)+10 |
| 023 1064 | Free for National Dialling Only | (0)+10 |
| 023 1065 | Free for National Dialling Only | (0)+10 |
| 023 1066 | Free for National Dialling Only | (0)+10 |
| 023 1067 | Free for National Dialling Only | (0)+10 |
| 023 1068 | Free for National Dialling Only | (0)+10 |
| 023 1069 | Free for National Dialling Only | (0)+10 |
| 023 1070 | Free for National Dialling Only | (0)+10 |
| 023 1071 | Free for National Dialling Only | (0)+10 |
| 023 1072 | Free for National Dialling Only | (0)+10 |
| 023 1073 | Free for National Dialling Only | (0)+10 |
| 023 1074 | Free for National Dialling Only | (0)+10 |
| 023 1075 | Free for National Dialling Only | (0)+10 |
| 023 1076 | Free for National Dialling Only | (0)+10 |
| 023 1077 | Free for National Dialling Only | (0)+10 |
| 023 1078 | Free for National Dialling Only | (0)+10 |
| 023 1079 | Free for National Dialling Only | (0)+10 |
| 023 1080 | Free for National Dialling Only | (0)+10 |
| 023 1081 | Free for National Dialling Only | (0)+10 |
| 023 1082 | Free for National Dialling Only | (0)+10 |
| 023 1083 | Free for National Dialling Only | (0)+10 |
| 023 1084 | Free for National Dialling Only | (0)+10 |
| 023 1085 | Free for National Dialling Only | (0)+10 |
| 023 1086 | Free for National Dialling Only | (0)+10 |
| 023 1087 | Free for National Dialling Only | (0)+10 |
| 023 1088 | Free for National Dialling Only | (0)+10 |
| 023 1089 | Free for National Dialling Only | (0)+10 |
| 023 1090 | Free for National Dialling Only | (0)+10 |
| 023 1091 | Free for National Dialling Only | (0)+10 |
| 023 1092 | Free for National Dialling Only | (0)+10 |
| 023 1093 | Free for National Dialling Only | (0)+10 |
| 023 1094 | Free for National Dialling Only | (0)+10 |
| 023 1095 | Free for National Dialling Only | (0)+10 |
| 023 1096 | Free for National Dialling Only | (0)+10 |
| 023 1097 | Free for National Dialling Only | (0)+10 |
| 023 1098 | Free for National Dialling Only | (0)+10 |
| 023 1099 | Free for National Dialling Only | (0)+10 |