AS15201 — Universo Online S.A.

AS15201 announces 0 IPv4 prefixes covering 0 addresses and 2 IPv6 prefixes.

About this network

No IPv4 at all: two IPv6 blocks and nothing else.

What it's used for

• An IPv6-only announcement from a large Brazilian internet company. Two IPv6 prefixes, no IPv4 prefixes, and one observed BGP neighbour.

Notable

• Zero IPv4 addresses are announced, which is unusual for an AS number first seen in 2000.
• Both announcements are /48 blocks from the same allocation, and they are not adjacent: several blocks separate them.
• No IPv4 prefixes exist in the inventory at all, so there is nothing for the registry lookups to describe and nothing to sample in reverse.
• The AS handle is the company's full registered name, spaces and full stops included, rather than an abbreviation.
• A sibling AS number in this same range belongs to the same corporate family and announces seventy IPv4 prefixes with netnames that are bare numbers.

Interesting

• Two /48 blocks from one allocation, announced separately with a gap between them, is a company routing exactly two sites out of an allocation big enough for tens of thousands. The gap says the other blocks exist and are used somewhere that does not route them here.
• An AS number carrying only IPv6 is usually an intentional split: v6 experiments or a specific service kept off the main number so a mistake cannot affect the v4 network.
• With no IPv4 space, every tool built around registry lookups and reverse DNS has nothing to say about this network. The routing table is the entire public record.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 2804:49c:3101::/48
• 2804:49c:3106::/48

Upstream networks

• AS7162 Universo Online S.A.

Adjacent networks

• AS7162 Universo Online S.A.