select entry in Code column to view full DE allocations in that range
| Code | DEF | Operator | Use | Notes |
| 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 | London National Dialling | |||
| 2020, 2021, 2022, 2023, 2024, 2025, 2026, 2027, 2028, 2029 | London expansion | |||
| 2030, 2031, 2032, 2033, 2034, 2035, 2036, 2037, 2038, 2039 | London | |||
| 2040, 2041, 2042, 2043, 2044, 2045, 2046, 2047, 2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, 2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, 2064, 2065, 2066, 2067, 2068, 2069 | London expansion | |||
| 2070, 2071, 2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, 2080, 2081, 2082, 2083, 2084, 2085, 2086, 2087, 2088, 2089 | London | |||
| 2090, 2091, 2092, 2093, 2094, 2095, 2096, 2097, 2098 | London expansion | |||
| 2099 | London Emergency Services |