| Melton Council EN | East Midlands | generic | Weekly | Pending | 0 |
| Merthyr Tydfil Council WL | Wales | generic | Weekly | Pending | 0 |
| Merton Council EN | London | generic | Weekly | Pending | 0 |
| mhs homes group EN | South East | in-tend | Weekly | Broken | 0 |
| Mid and East Antrim Borough Council NI | Northern Ireland | bravo | Weekly | Pending | 0 |
| Mid Devon Council EN | South West | generic | Weekly | Pending | 0 |
| Mid Suffolk Council EN | East of England | generic | Weekly | Pending | 0 |
| Mid Sussex Council EN | South East | generic | Weekly | Pending | 0 |
| Mid Ulster District Council NI | Northern Ireland | bravo | Weekly | Pending | 0 |
| Middlesbrough Council EN | North East | generic | Weekly | Pending | 0 |
| Midland Heart EN | West Midlands | atamis | Weekly | Broken | 0 |
| Midland Heart EN | West Midlands | atamis | Weekly | Broken | 0 |
| Midland Heart Limited EN | West Midlands | in-tend | Weekly | Broken | 0 |
| Midlothian Council SC | Scotland | generic | Weekly | Pending | 0 |
| Milton Keynes Council EN | South East | in-tend | Weekly | Broken | 0 |
| Minervapcs (In-Tend portal) EN | South East | in-tend | Weekly | Today | 7 |
| Ministry of Defence EN | South East | bravo | Weekly | Broken | 0 |
| Ministry of Housing, Communities and Local Government (MCHLG) EN | London | atamis | Weekly | Today | 98 |
| Ministry of Justice WL | London | bravo | Weekly | Today | 8 |
| Mole Valley Council EN | South East | generic | Weekly | Pending | 0 |
| Monmouthshire Council WL | Wales | generic | Weekly | Pending | 0 |
| Moray Council SC | Scotland | generic | Weekly | Pending | 0 |
| Muircroft Housing Association EN | South East | in-tend | Weekly | Broken | 0 |
| National Audit Office WL | — | delta | Weekly | Today | 1 |
| National Highways Limited WL | West Midlands | bravo | Weekly | Broken | 0 |
| National Museums Liverpool EN | North West | in-tend | Weekly | Broken | 0 |
| National Wealth Fund Limited WL | Yorkshire and the Humber | atamis | Weekly | Broken | 0 |
| NCC Operations Limited EN | South West | delta | Weekly | Today | 14 |
| NCC Operations Limited EN | South West | delta | Weekly | Broken | 0 |
| Neath Port Talbot Council WL | Wales | generic | Weekly | Pending | 0 |
| Network Rail Infrastructure Limited EN | London | bravo | Weekly | Today | 80 |
| Neupc (Delta eSourcing portal) EN | Yorkshire and the Humber | delta | Weekly | Today | 270 |
| New Forest Council EN | South East | generic | Weekly | Pending | 0 |
| New Forest National Park Authority EN | South East | in-tend | Weekly | Broken | 0 |
| Newark and Sherwood Council EN | East Midlands | generic | Weekly | Pending | 0 |
| Newcastle upon Tyne Council EN | North East | generic | Weekly | Pending | 0 |
| Newcastle-under-Lyme Council EN | West Midlands | generic | Weekly | Pending | 0 |
| Newham Council EN | London | delta | Weekly | Today | 92 |
| Newport Council WL | Wales | generic | Weekly | Pending | 0 |
| Newry, Mourne and Down District Council NI | Northern Ireland | bravo | Weekly | Pending | 0 |
| NHS Mid and South Essex Integrated Care Board EN | East of England | bravo | Weekly | Broken | 0 |
| Nhs Suffolk And North East Essex Integrated Care Board EN | East of England | in-tend | Weekly | Broken | 0 |
| Norfolk County Council EN | East of England | generic | Weekly | Pending | 0 |
| North Ayrshire Council SC | Scotland | generic | Weekly | Pending | 0 |
| North Devon Council EN | South West | generic | Weekly | Pending | 0 |
| North East Derbyshire Council EN | East Midlands | in-tend | Weekly | Today | 27 |
| North East Lincolnshire Council EN | Yorkshire and the Humber | generic | Weekly | Pending | 0 |
| North Hertfordshire Council EN | East of England | generic | Weekly | Pending | 0 |
| North Kesteven Council EN | East Midlands | generic | Weekly | Pending | 0 |
| North Lanarkshire Council SC | Scotland | generic | Weekly | Pending | 0 |
| North Lincolnshire Council EN | Yorkshire and the Humber | generic | Weekly | Pending | 0 |
| North Norfolk Council EN | East of England | generic | Weekly | Pending | 0 |
| North Northamptonshire Council EN | East Midlands | in-tend | Weekly | Broken | 0 |
| North Somerset Council EN | South West | generic | Weekly | Pending | 0 |
| North Star Housing Group EN | North East | in-tend | Weekly | Broken | 0 |
| North Tyneside Council EN | North East | generic | Weekly | Pending | 0 |
| North Warwickshire Council EN | West Midlands | generic | Weekly | 11d ago | 0 |
| North West Leicestershire Council EN | East Midlands | generic | Weekly | Pending | 0 |
| North Yorkshire Council EN | Yorkshire and the Humber | generic | Weekly | Pending | 0 |
| Northamptonshire Partnership Homes EN | East Midlands | delta | Weekly | Today | 19 |
| Northern Ireland Assembly Commission NI | Northern Ireland | delta | Weekly | Today | 4 |
| Northern Lighthouse Board EN | Scotland | delta | Weekly | Today | 83 |
| Northumberland Council EN | North East | generic | Weekly | Pending | 0 |
| Northumberland National Park Authority EN | North East | in-tend | Weekly | Broken | 0 |
| Northumbria University EN | North East | delta | Weekly | Broken | 0 |
| Norwich Council EN | East of England | generic | Weekly | 12d ago | 0 |
| Nottingham Community Housing Association Limited EN | East Midlands | in-tend | Weekly | Broken | 0 |
| Nottingham Council EN | East Midlands | generic | Weekly | Pending | 0 |
| Nottinghamshire and City of Nottingham Fire Authority EN | East Midlands | in-tend | Weekly | Today | 7 |
| Nottinghamshire County Council EN | East Midlands | generic | Weekly | Pending | 0 |
| NPL Management Limited EN | London | bravo | Weekly | Today | 14 |
| Nsah (Alliance Homes) Limited EN | South West | in-tend | Weekly | Today | 14 |
| Nuneaton and Bedworth Council EN | West Midlands | generic | Weekly | 7d ago | 0 |
| Oadby and Wigston Council EN | East Midlands | generic | Weekly | Pending | 0 |
| Ofcom EN | London | bravo | Weekly | Today | 14 |
| Office for National Statistics WL | Wales | in-tend | Weekly | Today | 1 |
| Office for Nuclear Regulation EN | North West | delta | Weekly | Broken | 0 |
| Office of Rail and Road EN | London | bravo | Weekly | Broken | 0 |
| Oil and Pipelines Agency EN | South East | delta | Weekly | Today | 22 |
| Oldham Council EN | North West | generic | Weekly | Pending | 0 |