ISP Lookup
Find out which internet service provider is serving your connection right now, plus your public IP address and connection location.
Your Current Connection
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What does this mean?
Your public IP address is the address the internet sees when your devices make requests. It is assigned by your ISP and can change if you reboot your router (on most home plans) or after a certain lease period.
The Autonomous System Number (ASN) identifies the network block your ISP owns. Large ISPs operate multiple ASNs. If you are using a VPN, the ASN and ISP shown will belong to the VPN provider, not your home internet provider.
What Is an ISP and Why Does It Matter?
An Internet Service Provider is the company that sells you access to the internet. Your ISP's infrastructure — the cables, exchanges, and routing equipment between your home and the rest of the internet — is the single biggest factor in determining your real-world connection quality.
Two people on identical 100 Mbps plans from different ISPs in the same city can have very different experiences, because the quality of the network, the amount of congestion during peak hours, and the routing paths to popular servers all vary by provider.
Some ISPs deliberately slow down certain types of traffic — particularly streaming video or torrents — during peak hours or after you exceed a data threshold. This is called throttling. Running a speed test using NDT7, which routes outside your ISP's own servers, helps detect this. See our guide on ISP throttling.
Most home broadband plans use dynamic IPs, which can change when your router reboots. Static IPs remain constant and are typically available as a paid add-on. A static IP matters if you run a home server, need consistent remote access, or use services tied to a fixed address.
Your ISP can see which IP addresses you connect to, the volume of data you transfer, and the timing of your connections. They cannot see the contents of HTTPS traffic, which is encrypted. Using a VPN hides your destination addresses from your ISP, though the VPN provider then sees that same data instead.
If your speed tests consistently fall well below your plan speeds during evenings, and wired tests confirm the issue is not your equipment, consider checking what other providers are available at your address. In many areas, competition is limited — but fiber and fixed wireless alternatives are expanding rapidly.
ISP speed comparison: what to look for
| Factor | Why it matters |
|---|---|
| Technology type | Fiber > cable > DSL for speed and consistency. VDSL can close the gap vs. cable at short distances. |
| Upload speed | Often ignored, but critical for video calls, cloud backup, and uploading content. |
| Data caps | Some plans throttle after a monthly data threshold. Unlimited plans are standard on fiber but vary on cable. |
| Contract length | Month-to-month plans offer flexibility. 12–24 month contracts typically come with lower monthly rates. |