WhatsMyConnectionCIDR

Routing intelligence tool

Prefix lookup

Prefix lookup for CIDR ranges, origin ASN context, registry data, BGP fixture hints, RPKI, IRR, and source-labeled warnings.

CIDRNetwork range

Normalize the prefix and show the address family and prefix length.

RoutingOrigin ASN context

Connect the range to BGP, RDAP, RPKI, and IRR hints when public sources return data.

FreshnessSource labels

Responses keep source names, cache state, freshness, and partial-result warnings visible.

What this prefix lookup returns

The lookup accepts IPv4 and IPv6 CIDR notation, then returns a structured result suitable for humans and scripts.

Prefix lookup FAQ

What is a prefix lookup?

A prefix lookup checks an IP network written in CIDR notation and returns registry, route, and source-labeled routing context when available.

What does CIDR mean?

CIDR notation combines a network address and prefix length, such as 1.1.1.0/24, to describe a range of IP addresses.

Can prefix lookup show route validation?

Yes. Prefix results can include RPKI and IRR status when those public sources return data.