How to Check Internet Speed Before You Move or Rent
Bad internet is the one thing about a home you cannot renovate, negotiate, or get used to. It is also the easiest thing to check before you commit, and almost nobody does it until the boxes are already in the hallway.
Start with the area, then get local
Cable plant ends at a specific pole. Fiber builds stop at a specific intersection, often because a developer paid for one subdivision and not the next. A house 400 metres from a gigabit street can be stuck on 12 Mbps DSL. No open measurement dataset sees that boundary: county is the finest geography M-Lab publishes, so one set of numbers covers the town centre and the far side of the ridge alike.
Put the exact street address into SignalScout and it resolves to the county the address sits in, then reports what people across that county actually measured. Read it as the character of the area rather than a forecast for your wall socket. A healthy county median means good service exists somewhere nearby, which is not the same as at your door. A weak one means you should assume you will have to work for a decent connection, and start asking the local questions below early.
The numbers that matter for a home you have not lived in
| If you... | Watch this number | Comfortable range |
|---|---|---|
| Work from home on video calls | Median upload and latency | 20+ Mbps up, under 40 ms |
| Stream 4K on multiple TVs | Median download | 100+ Mbps for a busy household |
| Game competitively | Latency, then upload | Under 30 ms |
| Upload video, photos, or code | Median upload | 100+ Mbps means fiber is likely present |
| Want a feel for the area overall | Connectivity Score | Around 50 is a typical US county |
For context on where an address sits nationally, the Connectivity Score ranks its county against every other US county: the median county measures 85 Mbps down, the 25th percentile 60 Mbps, and the 10th percentile 38 Mbps. These are M-Lab's NDT numbers, so they read lower than advertised rates; what matters is the rank. A score in the twenties is not a disaster, but it tells you to plan around it.
Apartments and condos need extra care
Multi-dwelling buildings break the simple picture in both directions. The county median blends your building with every other measured household for miles, including single-family homes on a different technology. A building can also have an exclusive marketing arrangement, a bulk-billed internet package baked into rent, or riser wiring that only supports one provider's coax.
Ask about the wiring, not the marketing. "High-speed internet available" in a listing means nothing. Ask what is physically terminated in the unit: is there a live coax drop, an ONT on the wall, an Ethernet jack in the closet? Ask which provider the last tenant used and what they paid for.
Questions to ask before you sign
| Ask the landlord or seller | Why it matters |
|---|---|
| Which provider was used here, and at what speed tier? | Turns a guess into a known-good configuration |
| Is there an existing ONT, coax drop, or DSL pair in the unit? | Existing equipment means service was really installed, not merely "available" |
| Is internet bundled into rent or an HOA fee? | You may be paying for a provider you would not choose |
| Has anyone been told a line extension or construction charge is required? | A four- or five-figure build quote is a deal fact, not a detail |
| Is satellite or a roof-mounted antenna permitted? | Your fallback plan can be blocked by a lease clause or HOA rule |
Sanity-check the ISP's answer
Every provider has a "check availability" box, and they are optimistic by design. An address can return "service available" and then fail at the survey stage because the drop is too long, the pole needs make-ready work, or the node is at capacity. Treat an online availability result as a lead, not a promise, and get an install date in writing before you rely on it.
Measured county data is the useful counterweight here. If a provider says gigabit fiber is available but the measured upload across the whole county is 11 Mbps, something in that story needs explaining — either the fiber is new and thinly taken up, or the "available" claim is a filing rather than a fact. The guide to coverage-map accuracy covers how both kinds of error happen.
Timing, which people always underestimate
- Standard installs typically land within one to two weeks of ordering, but appointment slots tighten at the end of the month and around university term starts.
- New drops or line extensions can take months if pole attachments or permits are involved.
- Fixed wireless and satellite can be self-installed in days, which makes them a reasonable bridge even if you plan to switch later.
- Transferring service is not automatic. If your current provider does not serve the new address, you are a new customer with a new install queue.
A five-minute routine
- Run the exact address through SignalScout and note download, upload, latency, and how many measurements the county figure rests on.
- Look at the year-by-year trend shown with the result, which runs back to 2020 at state level, to see whether the area is improving or flat.
- Shortlist two or three addresses and put them head to head using the comparison guide.
- Run the address through the FCC National Broadband Map and each candidate ISP's availability checker to get provider names, which SignalScout does not currently supply.
- Ask the landlord, seller, or a neighbour the wiring questions above.
Five minutes of this beats a year of apologising on video calls.
Common questions
Can I check an address before I have the keys?
Yes. SignalScout only needs a US street address, which it geocodes through the US Census Geocoder. Nothing is installed and no account is needed, so you can check a listing the moment you find it.
What if the address is a new-build with no measured data?
The county will almost always have measurements, but none of them come from a subdivision that did not exist yet, so the figure describes the older housing around it. In a thinly measured county, fewer than 300 measurements means SignalScout reports "Not enough data" instead of guessing, and the state figure is the next best context.
Does a good county figure guarantee I will get that speed?
No. The county figure is the median of what people across a whole county measured on the plans they bought, using their own equipment and Wi-Fi. Your speed depends on the provider you choose, the tier you pay for, and your own router, so treat it as evidence about the area rather than a promise about your unit.
Should I trust the ISP's availability checker instead?
Use both. The ISP checker is the only place that gives you provider names and prices, but it reflects a filed claim about serviceability. Measured county data tells you what those claims turn into in practice across the area.
Check a real address
See the measured download, upload and latency for any US address, plus a Connectivity Score ranked against every county in the country.