Country profile · US
IP addresses and ISPs in United States
North America, Americas · administered by ARIN · .us
Capital
Washington, D.C.
Region
Americas
Subregion
North America
Internet registry
ARIN
Country TLD
.us
Calling code
+1
Currency
USD
Languages
English
Internet infrastructure in United States
IP addresses allocated to United States (US) are managed by ARIN, the regional internet registry serving Americas. ARIN delegates IP ranges to local registries, ISPs, and large organizations, who in turn assign individual IPs to customers and devices.
When you see an IP geolocated to United States, it usually reflects the country its block is registered to — though the actual user could be elsewhere if they're on a VPN, a multinational corporate network, or a cloud provider with regional egress points in United States.
Public DNS in United States
Most users in United States rely on DNS servers provided by their ISP. For better performance and privacy, public DNS servers from Cloudflare, Google, Quad9, and others are usually faster and don't share queries with the local ISP.
Common privacy considerations
Whether you're a resident of United States or visiting, the same network fundamentals apply: your public IP reveals approximate location and ISP, your DNS queries can leak outside any VPN tunnel, and modern privacy-focused browsers help limit what websites can fingerprint about you.
Tools to investigate IPs in United States
- IP Lookup — enter any IP to see geolocation, ISP, ASN, and timezone.
- WHOIS Lookup — registry-level allocation details for any IP or domain.
- Blacklist Check — verify an IP isn't on common spam lists.
- Hostname Lookup — resolve a .us domain to its IPs and DNS records.
Frequently asked questions
Which regional internet registry allocates IPs in United States?
ARIN — the regional internet registry for North America, parts of the Caribbean, and several North Atlantic islands.
What is the country code top-level domain for United States?
United States's ccTLD is .us. ccTLDs are reserved for use by entities connected to the country — most domain registrars in United States sell second-level domains under it.
How can I find an IP address from United States?
Use our IP Lookup tool with any IPv4 or IPv6 address. The tool reports geolocation, ISP, and ASN. IPs allocated to United States usually carry registry data showing United States as the registered country.
Why does an IP in United States sometimes geolocate elsewhere?
IP geolocation is approximate — based on ISP-supplied data and routing observations. CGNAT (where many subscribers share one public IP), VPNs, and corporate networks can place an IP visually far from the user's actual location. Mobile carrier IPs in particular often resolve to the carrier's central data center, not the subscriber.
Are there public DNS servers in United States?
Cloudflare (1.1.1.1), Google (8.8.8.8), and Quad9 (9.9.9.9) operate global anycast DNS networks with edge points in or near most countries — including United States where coverage permits. Local ISPs in United States also operate their own resolvers, which are usually used by default.