United States ASN and IP Address Allocation: What the Country-Level Data Shows

The United States leads the IPIP.NET country-level table with 32,219 allocated ASNs, 18,855 announced ASNs, 1,497,299,200 IPv4 addresses, and 975,910,303,763,789 IPv6 /64 blocks. That makes it the largest single country/region in the dataset on both ASN count and IPv4 volume. The figures describe allocation and routing visibility, not active device counts or population-adjusted usage—so read them as registry and routing signals rather than a census of the internet.

What the two ASN columns actually mean

An Autonomous System Number (ASN) identifies a network that presents a single routing policy to the internet. The table splits ASNs into two states:

• Allocated ASNs — the number of ASNs assigned to organizations in that country/region by a registry. This is an administrative count: an ASN can be allocated and sit unused.
• Announced ASNs — the number of ASNs actually visible in global routing (their prefixes appear in BGP). This is the operational count.

The gap between them is the useful signal. For the United States, 32,219 allocated versus 18,855 announced means roughly 41% of allocated ASNs are not visible in routing. A large gap usually points to reserved capacity, dormant allocations, or organizations that hold an ASN but announce through a parent or upstream network instead.

Reading the IP columns

The IPv4 figure is a straight address count, so 1,497,299,200 for the United States is about 1.5 billion addresses. The IPv6 figure is expressed in /64s because a single /64 is the standard subnet size—one /48 contains 65,536 /64s, and one /32 contains about 4.3 billion /64s. That is why the IPv6 column reaches into the hundreds of trillions: the unit is tiny, not the allocation enormous in human terms. Do not compare the IPv4 and IPv6 columns directly; they use different units.

How the United States compares

Using the same four columns across the top countries in the table:

Three patterns stand out:

1. ASN scale is not proportional to IPv4 scale. The United States holds about 3.5× Brazil's allocated ASNs but roughly 19× its IPv4 addresses. China has fewer allocated ASNs than Brazil yet about 4.6× the IPv4 addresses.
2. Announced-to-allocated ratios vary widely. Brazil announces 96% of its allocated ASNs; India announces only about 47%. The United States sits near 59%. A high ratio suggests allocations are actively routed; a low ratio suggests many holders are dormant or route through others.
3. The United States leads both ASN columns and the IPv4 column by a wide margin. No other country/region in the table is close on allocated ASNs, and the IPv4 total is roughly 4× China's, the next largest shown.

What the data does not tell you

• Allocation ≠ usage. An allocated IPv4 address may be unused, parked, or held for future deployment. The table counts registry allocations, not hosts online.
• Announced ≠ allocated. An ASN can be announced from infrastructure physically outside its registered country/region, and a single organization can announce multiple ASNs.
• IPv6 /64 counts are not comparable to IPv4 counts. They measure a different unit of address space.
• No per-capita or per-network normalization. The table gives absolute totals, so larger or more network-dense countries naturally rank higher.

When this data is the right reference

Use the IPIP.NET country/region table when you need to:

• Compare how many independent networks (ASNs) operate in a country/region versus how many are actually routed.
• Gauge the relative size of IPv4 and IPv6 allocations across countries.
• Identify countries with a large allocated-but-unannounced ASN pool, which can indicate dormant registry capacity.

It is not a source for active user counts, traffic volumes, or internet penetration. For those, allocation and routing data are inputs, not answers.