What an ISP is and why this lookup exists
Your Internet Service Provider (ISP) is the company that connects your home or office to the wider internet — cable, fiber, DSL, fixed wireless, or mobile broadband. Every public IP address on the internet is allocated to an organization through regional registries. GeoIP and ISP databases map those allocations so tools can answer “who owns this IP?” in human-readable form. Routerpedia’s free “What Is My ISP?” page uses that mapping for the address we see on your visit.
People search for this when opening a support ticket, checking whether a VPN is active, verifying a new fiber cutover, or understanding why a website localized them to a certain region. It pairs naturally with our public IP tool and router setup guides that mention ISP-specific gateways or DNS.
How IP-to-ISP databases work
Registries assign large blocks of addresses to carriers and cloud providers. Databases reconcile WHOIS-style records, routing announcements (ASN data), and commercial research into fields like ISP name, organization, country, and approximate city. The ASN (Autonomous System Number) identifies a routing domain — useful when comparing two IPs that look different but belong to the same backbone.
Retail brand names do not always match the registered organization. A regional cable company might appear under a parent holding name. Mobile networks may show the carrier or a roaming partner. Hosting providers and VPNs often flag as datacenter or proxy-like in richer datasets. Treat the result as “network owner hints,” not a legal identity document.
Accuracy limits you should expect
Country and region are usually reasonable; city can be wrong, especially for mobile IPs, satellite internet, and corporate VPNs. If you use a VPN, the ISP field will describe the VPN exit network, which is exactly how sites geo-locate you while the tunnel is up. Turn the VPN off and reload to see your residential provider again. CGNAT and shared Wi‑Fi (cafés, hotels) show the venue’s upstream network, not your home account name.
Outdated database rows exist. If you recently switched ISPs but kept a transferred IP block — uncommon for residential — labels might lag. When something looks off, compare with What is my IP? and your ISP account portal’s reported WAN address.
Using ISP info in router troubleshooting
Support agents often ask which provider you use because outage maps, modem requirements, and VLAN tags differ. Knowing your ASN/org helps when double-checking whether you are still on the ISP gateway or accidentally bridged behind another router (double NAT). If port forwarding fails, confirm you are not on CGNAT with your provider — shared public IPv4 is increasingly common and blocks classic inbound hosting.
DNS recommendations also vary: some ISPs break resolution when you hard-code incompatible DNS, while others work fine with Cloudflare or Google resolvers. After changing DNS on the router, validate domains with DNS Lookup. For LAN-side device addressing, keep using local IP detection and DHCP reservations.
Residential, business, and mobile ISP differences
Residential cable, fiber, and DSL accounts typically use dynamic public IPs, accept consumer routers, and may sit behind CGNAT on IPv4. Business circuits often include static IPs, service-level agreements, and stricter acceptable-use policies. Mobile hotspots report carrier ASNs that differ from your home fiber brand even when the same company owns both. This lookup reflects whichever network you are on right now — tethering from a phone while visiting a friend shows mobile data, not their ISP.
Fixed wireless and satellite providers sometimes geolocate IPs to a ground station far from your cabin or farm. That affects streaming rights and weather-specific outage maps. If you operate a small office from home, confirm whether your plan allows commercial use before relying on residential support queues. Compare WAN readings with What is my IP? and verify you are not tunneling through a VPN using What is my proxy?.
What to tell ISP support (and what to check first)
Before calling, reboot the modem and router, note whether all devices fail or only Wi‑Fi clients, and copy the public IP and ISP fields from this page. Mention your city if it looks wrong — agents can confirm whether an outage map applies. Ask explicitly about CGNAT if inbound port forwarding never worked despite correct LAN settings. Have your account number and the MAC address printed on the modem ready; avoid sharing router admin passwords.
Run DNS Lookup on a failing domain to separate DNS issues from pure packet loss. Capture local IP info when the ticket involves “cannot reach printer from laptop.” If support asks you to browse to a status URL, note your user agent in case their portal mishandles mobile browsers.
Modem, ONT, and router handoffs by provider type
Fiber installs may terminate at an ONT that hands off Ethernet to your router — the ISP field still identifies the fiber company even if you purchased a third-party mesh system. Cable modems sync on coax and expose a single LAN port or bridge mode for your gear. DSL and fixed wireless often embed PPPoE or VLAN credentials you must enter in the WAN page. Misconfigured WAN types show “connected” locally while the ISP side never assigns a valid public address.
Some ISPs ship combined gateway units that double as Wi‑Fi routers. Putting another router behind them without bridge mode creates double NAT and confusing traceroutes. Look up default gateway IPs in our IP addresses guides when deciding which box to configure. After any handoff change, reload this ISP page and confirm the organization field matches expectations before re-opening port forwards or dynamic DNS. Note the ASN in your home network binder — it helps when filtering logs or comparing traceroutes during intermittent routing issues.
Privacy and data sources
This page looks up the public IP associated with your request using a free GeoIP API. Approximate location fields are derived from IP intelligence, not from your GPS. We display results for your session; see our privacy policy for how Routerpedia handles site analytics and contact forms. We do not need your router admin password for an ISP check.
For safer Wi‑Fi hygiene while you are already troubleshooting connectivity, generate a strong passphrase with the WiFi Password Generator and share it via the Wi‑Fi QR Code Generator. More utilities live on the free network tools hub. Bookmark this ISP page after major provider changes so you always have ASN and organization details handy for the next outage.