Residential IP

The North American registry does define the word. ARIN calls residential customers "individual persons and not organizations" who receive service "at a place of residence for personal use only". Its rules only ask providers to register blocks of eight addresses or more, so a single home address rarely has a whois record of its own.

Even a registered home block may read "Private Customer" and "Private Residence" instead of a name and a street. The registry tells a site which provider holds the space, and little about the household.

Most checks therefore start one level up, with the network that announces the address: its ASN. Many operators declare a type for their network in PeeringDB, a database the networks maintain themselves. Almost a third of all ASNs are listed there. On 19 September 2026 Comcast listed its network as Cable/DSL/ISP, while Hetzner Online and DigitalOcean listed theirs as Content. The type is a statement, not a test: Deutsche Telekom, Verizon and AT&T, three of the largest home providers, listed theirs as NSP, a transit type.

The commercial databases add their own labels on top. MaxMind sorts addresses into 15 user types, residential among them, and into connection types such as Cable/DSL and Cellular. IP2Location uses codes such as Fixed Line ISP, Mobile ISP and Data Center/Web Hosting/Transit. IPinfo types the owner of a network as isp, hosting, business, education or government.

The lists do not line up, so one address can carry different labels in different databases. A site sees only the one it uses.

Reverse DNS is a weaker clue than it looks. A guide to common DNS errors asked in February 1996 for a matching PTR record behind every IP address. When we checked 300 live addresses from networks that declare themselves Cable/DSL/ISP, only 112 returned a name at all.

Of those, 87 were generic names built from the address or carrying words such as dynamic, adsl or pppoe. Hosting networks build names from the address too: 47 of the 136 named addresses in our hosting sample did. A name like that proves little on its own. Words such as vps or dedi, which 48 of those hosting names carried, say more.

Not always. Carrier-grade NAT puts many subscribers behind a single public address. In April 2012 the range 100.64.0.0/10 was reserved for the inside of such networks.

An IETF memo of June 2011 had already expected one public IPv4 address to be "shared by multiple homes or small businesses". It listed geolocation among the services that would be affected, and blocklists too: a ban or a location attached to that address applies to everyone behind it.

The trust behind the label is why residential addresses are rented out. A residential proxy routes traffic through such an address. In March 2026 the FBI described how proxy networks get them: with the owner's consent, or without it.

It named SDKs inside mobile apps, free VPNs with hidden terms, compromised TV streaming devices and picture frames, malware, and bandwidth sharing apps that promise to pay for the connection. The same alert told businesses to block addresses known to belong to residential proxy networks.

The databases flag them too. MaxMind marks an address that "belongs to a residential ISP" but sits on a suspected anonymizing network, with a confidence score from 1 to 99. A residential label is no longer a pass on its own.

Sorting addresses by who uses them began with email, years before anyone sold a residential proxy. In 1997 Dave Rand and Paul Vixie started keeping a list of addresses that had sent them spam, which became the Real-time Blackhole List. Others built DNS blocklists that listed different categories of addresses, among them dial-up and dynamic ranges. A home connection had no reason to deliver mail to other servers directly.

In January 2007 Spamhaus launched its Policy Block List. In its own words it "builds on the concept of older dynamic/dialup lists", but covers end-user ranges in general. A year later, more than 500 internet providers had submitted roughly 100 million of their own addresses to it.

The registries argued over the privacy side in the same years. ARIN members debated proposal 2003-3 on hiding home customers in whois in November 2003, with spam and abuse contacts as much in the argument as privacy. Today's rules let a provider show "Private Residence".

The proxy market turned the old lists around. Mail servers refuse end-user ranges because a person, not a server, should be behind them. Websites trust the same ranges for the same reason, and that trust is what a residential proxy sells.