Published October 7, 2026

You open a website you've used a hundred times and get a page that says "Your network (ASN) has been flagged for abuse. To protect our site, sign-in is required." You didn't spam anyone. You didn't run a bot. So what exactly got flagged, and why you?

The short answer: it's almost never about you personally. The website has judged the network you're connecting through, and that network is shared with thousands or millions of other people. This guide explains what an ASN is, why a whole network gets flagged, and what you can actually do to get back in.

What the Message Means

This exact wording is best known from SteamDB, the popular Steam game database, but the idea behind it is used by many sites. Websites protected by Cloudflare can show a similar block as Error 1005: "The owner of this website has banned the autonomous system number (ASN) your IP address is in." Other sites just show endless CAPTCHAs, "unusual traffic" warnings or a plain "Access denied."

All of these mean the same thing. Before looking at who you are, the site looked at where your connection comes from, and it didn't like the answer.

What Is an ASN?

The internet is a network of networks. Every large network, whether it's your internet provider, a mobile carrier, a cloud company or a VPN service, gets an Autonomous System Number (ASN). In North America these numbers are handed out by ARIN, the regional internet registry, and each one comes with blocks of IP addresses that the network owns.

A few examples you might recognize:

Your IP address always belongs to one of these networks. You can see yours, along with the organization behind it, on the Network Information page.

Why Websites Block a Whole Network

Blocking one IP address at a time doesn't work well against bots. A scraper or spam operation can rent a new IP from the same cloud provider in seconds. So when a site sees a lot of abuse coming from one network, it raises the bar for everyone on that network: a CAPTCHA, a required sign-in, or a hard block.

It's a blunt tool, and site owners know it. Regular users get caught in the same net as the bots, which is exactly what happened to you.

The Most Common Reasons You're Flagged

1. You're using a VPN or proxy

This is by far the most common cause. VPN servers run in data centers, and every user on a server shares the same exit IP. If even a few of them use it for scraping, credential stuffing or ban evasion, the VPN's network ends up flagged. Free VPNs are hit hardest because they attract the most abuse. Not sure whether your VPN or proxy is active? The IP address checker shows whether your connection looks like a VPN, proxy or Tor.

2. Your connection comes from a data center

Cloud servers, remote desktops, some corporate networks and "privacy relays" all connect from hosting networks like AWS or DigitalOcean. Real people rarely browse from these networks, while bots almost always do, so many sites treat any data-center ASN as suspicious by default.

3. You're on mobile data or a hotspot

Mobile carriers, and fixed wireless home internet from T-Mobile, Verizon or AT&T, use a technique called CGNAT. It puts hundreds or thousands of customers behind the same public IP address. If one of them is running a bot, every phone sharing that address can inherit the bad reputation.

4. A device on your network is misbehaving

Less common, but worth ruling out. Malware on a computer, a hacked smart camera or an old router with known security holes can send spam or attack traffic from your connection without you noticing. In that case it's your own IP address that ends up on blacklists, not just your network.

5. Your browser looks like a bot

Many sites combine the network score with a check of your browser. Unusual user agents, aggressive privacy extensions or user-agent spoofers can tip a borderline network into a block. If the page loads fine in another browser on the same connection, this is likely the cause.

How to Check What's Being Flagged

1. Open the Network Information page and note your ASN and the organization behind it. If you see a cloud or VPN company instead of your internet provider or mobile carrier, a VPN, proxy or relay is active. The home page confirms it under VPN/Proxy Detected.
2. Run the IP Blacklist Checker. It shows your Abuse Confidence Score and whether your IPv4 and IPv6 addresses are reported in abuse databases.
3. Compare the two. A clean IP on a flagged network means the site is blocking the whole ASN, and the fix is a different network. A reported IP means your own address has a bad history, either inherited or caused by a device on your network.

How to Fix It

Start with the step that matches what you found above. Most people are back in after the first or second one.

Sign in, if the site offers it

When the message says sign-in is required, that's the site offering you a way around the block. Once you're logged in, the site judges your account instead of your network. For SteamDB, that means signing in through Steam. Just double-check you're on the real domain before entering your password.

Switch VPN servers or pause the VPN for that site

If you're on a VPN, connect to a different server, ideally in a different city, since each server uses a different IP and sometimes a different network. If that doesn't help, use your VPN's split tunneling feature to send just that one site outside the VPN. Some paid VPNs also sell a dedicated IP that only you use, so its reputation depends only on you. The VPN comparison shows which providers offer it.

Try a different kind of connection

On mobile data, switch to Wi-Fi. On Wi-Fi, try your phone's mobile data. Changing the type of connection changes your ASN entirely, which is the one thing that reliably gets you past a network-wide block. It's also the quickest way to test whether the problem is your network or your account.

Get a new IP address from your provider

Restarting your modem or router can give you a new IP address. Unplug it for 5 to 10 minutes, since many providers keep the same address on a short restart. Be realistic about what this does: a new IP helps if the site judges individual addresses, but it won't help if the site blocks your whole ASN, because the new address belongs to the same provider.

Try another browser

Open the site in a different browser with no extensions, or in a private window. If it works there, turn your extensions back on one by one to find the culprit. User-agent switchers and fingerprint randomizers are the usual suspects.

Clean up your own network

If the blacklist check showed reports against your own IP, run a malware scan on your computers, update your router's firmware and change its admin password, and check which devices are connected to your Wi-Fi. Then request removal from the blacklist that lists you. The blacklist FAQ explains how delisting works.

Contact the site or your provider

If nothing else works, write to the website's support team and include your ASN number (for example "AS7922") and the exact message you see. Site owners can't fix false positives they don't know about. If your IP is listed for activity you can't explain, contact your internet provider as well. They may be able to assign you a different address.

Frequently Asked Questions

A flagged network is frustrating, but it's rarely a sign that something is wrong with you or your computer. Check your ASN, see whether your own IP has a bad history, and switch networks or sign in. That's usually all it takes.