IP21 postcode district: Diss and around

IP21 is a postcode district mostly in Suffolk, with 530 postcodes in use in 2 sectors. It has postcodes in Diss. It is split between 2 councils: Mid Suffolk (302 postcodes) and South Norfolk (228). 302 are in Suffolk and 228 in Norfolk.

Postcodes in use: 530
Sectors: 2
Councils: 2 councils
Places: Diss

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. See all our data sources

Every postcode in IP21, by gigabit broadband

No home or business can get gigabit: 226
Some can get gigabit: 100
Every home and business can get gigabit: 199
Ofcom gives no figure: 5
Outline: where 5 or more postcodes without gigabit lie together

Of the 530 postcodes in IP21 that ONS places, 226 have no home or business that can get gigabit, 100 have some that can, 199 can all get it and 5 have no Ofcom figure.

Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. A dashed outline shows where 5 or more lie within 410 metres of each other. It is not a boundary, and no boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode.

The middle of its postcodes: latitude 52.3645, longitude 1.2370. Open this area on OpenStreetMap

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; gigabit: Ofcom, Connected Nations, Spring 2026; roads, rivers and built-up areas: Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre. How we use them

Postcodes without gigabit

226 postcodes here have no gigabit. These are the 12 first in postcode order.

IP21 4AA IP21 4AB IP21 4AD IP21 4AE IP21 4AF IP21 4AG IP21 4AH IP21 4AL IP21 4AP IP21 4AQ IP21 4AR IP21 4AS

Where the postcodes without gigabit lie together

36 postcodes without gigabit, outlined on the map. IP21 5SP, is the one nearest the middle of them.
29 postcodes without gigabit, outlined on the map. IP21 5HG, is the one nearest the middle of them.
12 postcodes without gigabit, outlined on the map. IP21 4LD, is the one nearest the middle of them.
9 postcodes without gigabit, outlined on the map. IP21 5AT, is the one nearest the middle of them.
8 postcodes without gigabit, outlined on the map. IP21 4AE, is the one nearest the middle of them.
5 postcodes without gigabit, outlined on the map. IP21 5TG, is the one nearest the middle of them.

What broadband can you get in IP21?

Ofcom reports on 525 of the 530 postcodes in IP21. At 199 of them every home and business can get gigabit broadband, and at 18 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit199 of 525

Postcodes where every home can get superfast410 of 525

Postcodes where some cannot get decent broadband18 of 525

Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.

Check one address on Ofcom's checker

Source: Ofcom, Connected Nations, Spring 2026, data for January 2026, Open Government Licence v3.0. How we use it

Is IP21 at risk of flooding?

40 of the 530 postcodes in IP21 have a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts 91 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 40 of 530 postcodes High: 78Medium: 13Low: 60

High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.

Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.

Source: Environment Agency, Risk of Flooding from Rivers and Sea (postcodes in areas at risk), published 6 July 2026, Open Government Licence v3.0. How we use it

What do homes sell for in IP21?

Homes in IP21 sold for a typical £350,000 in the 12 months to August 2026, across 131 sales, up 9.4% on the 12 months before, HM Land Registry's figures show.

£350,000 typical price, the 12 months to August 2026

£320,000 12 months to August 2025

▲ up 9.4% on the 12 months before

Detached £468,000 83 sales
Semi-detached £257,500 35 sales
Terraced £225,000 11 sales
Flat or maisonette 2 sales, too few to price

Each bar is that kind's typical price, against the most expensive kind here.

Standard sales of homes at market value. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.

Source: HM Land Registry Price Paid Data, files dated 28 September 2026. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0. How we use it