What Is an ISP Proxy? Static Residential Proxies Explained

An ISP proxy is a static IP address registered to a consumer internet service provider but hosted on a server in a data center. Websites and IP databases see an address that belongs to a provider like Comcast or Verizon, while you get datacenter speed, uptime and an IP that stays the same for as long as you rent it. That is why ISP proxies are also called static residential proxies: residential-grade reputation without rotation.

How ISP proxies are made#

Every IP block is announced by an autonomous system (ASN) and registered to an organization. IP intelligence databases use that registration, along with other signals, to label each block as consumer ISP, business, mobile or hosting. Anti-bot systems lean heavily on those labels.

A provider builds ISP proxies by obtaining address space that is registered to a consumer ISP, through agreements with the ISP or its partners, and routing it to proxy servers in data centers with fast uplinks. The result combines two properties that normally do not go together:

• The reputation of a consumer network. WHOIS and ASN lookups show the ISP, so the address is usually classified as ISP rather than hosting.
• The infrastructure of a data center. No home device sits in the path. The server is always on, latency is stable, and the connection is not shared with a household.

How to check an IP's classification#

You can see what a website sees. Look up the ASN and organization behind the exit IP, for example with whois or an IP intelligence service. An ISP proxy should show a consumer provider as the owner, not a cloud or hosting company:

curl -s -x http://IP:PORT -U "USERNAME:PASSWORD" https://ipinfo.io/org
# example output: AS7922 Comcast Cable Communications, LLC

Databases differ, and some also flag addresses with a history of heavy automated traffic, so treat any single lookup as one signal among several.

Our ISP proxies are private to your account, include unlimited bandwidth and support HTTP and SOCKS5 over TCP and UDP. They are available in 17 locations: New York, Los Angeles, Virginia and the Comcast and Verizon carrier pools in the US, plus Canada, Germany, the UK, Hong Kong, Japan, France, Italy, Poland, Spain, Singapore, Moldova and South Korea.

ISP vs residential vs datacenter proxies#

In short: residential gives you breadth, datacenter gives you cheap speed, and ISP gives you a trusted identity that stays put. For the residential and datacenter trade-off in depth, see residential vs datacenter proxies.

What ISP proxies are good for#

Account management#

Platforms watch where an account logs in from. An account that appears from a new country every session triggers verification prompts and reviews. An account that always connects from the same consumer IP looks like what it usually is: one business working from one office. Assign one ISP IP per account and keep it for the life of the account. This pairs well with browser profiles that store cookies per account. Stay within each platform's rules on running multiple accounts; a stable IP does not change those rules.

Ad verification#

Checking that campaigns render correctly in New York, Frankfurt or Tokyo needs IPs that ad networks treat as real users, and long checks need the same IP from start to finish. ISP IPs in fixed locations give repeatable results, so a change in what you see reflects the campaign, not the proxy.

E-commerce operations#

Seller dashboards, marketplace back offices and checkout testing involve logged-in, multi-step sessions that can last hours. Static IPs keep those sessions intact, and unlimited bandwidth means long sessions and heavy pages do not run up a per-GB bill. For high-volume price monitoring across thousands of products, rotating residential is usually the better fit, and many teams run both side by side.

Setup: list format and connection#

ISP proxies are delivered in under an hour after payment, as a list of ip:port:username:password lines. Download it from the dashboard or fetch it through the account API:

# Fetch your ISP proxy list as plain text
curl -H "Authorization: Bearer $API_KEY" "https://api.proxonym.com/v1/proxies/isp?format=txt"

# HTTP and SOCKS5 share the same port on each IP
curl -x http://IP:PORT -U "USERNAME:PASSWORD" https://api.ipify.org
curl -x "socks5h://USERNAME:PASSWORD@IP:PORT" https://api.ipify.org

Unlike the rotating gateway, ISP proxies take no username parameters: the location is fixed per IP and the IP never rotates. If you split a list across a team or clients, keep your own inventory of which IP belongs to which account, so an identity never moves between IPs.

How ISP proxy pricing works#

ISP proxies are priced per IP for a fixed term of 1, 7, 30 or 90 days, with no bandwidth metering. The unit price drops with volume:

The Comcast and Verizon carrier pools and South Korea are priced slightly higher. Short terms suit one-off projects such as a campaign check; long-lived accounts are better served by 30 or 90-day terms. Plans never auto-renew, so note when each term ends. Every tier is on the pricing page.

Compare the cost per identity, not per gigabyte. In standard locations, one ISP IP for 30 days costs between $1.15 and $2.18 depending on volume, however much traffic the account generates. Running the same account through a residential sticky session would mean a new IP at least every 120 minutes, plus per-GB charges; rotating vs sticky sessions explains those limits.

When an ISP proxy is the wrong choice#

• Massive scraping. A few hundred static IPs cannot spread millions of requests the way a rotating pool can, and heavy use of a small set of IPs gets them rate-limited. Use rotating residential proxies for breadth.
• Locations outside the 17. If you need a city or country that is not on the list, residential targeting covers 195+ countries.
• Mobile-first platforms. Apps that expect carrier traffic trust mobile IPs more.
• Disposable identities. If every task should look like a new visitor, rotation is cheaper and simpler than renting static IPs.

Key takeaways#

• An ISP proxy is a static IP registered to a consumer ISP and hosted in a data center.
• It combines consumer-network reputation with datacenter speed and an IP that never changes during your term.
• Use it for accounts, ad verification and long e-commerce sessions; use rotating residential for large-scale scraping.
• Pricing is per IP with unlimited bandwidth, from $10.91 for 5 IPs for 30 days down to $1.15 per IP at 5,000 IPs.
• Keep one IP per account, and keep that mapping stable.