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IPv4 prefixes

AS5721 NDU-NET

Unclassified ARIN

Overview Prefixes1 Peering Exchanges Security Graph

Shape and geography IPv4 prefixes 1 IPv6 prefixes 0

Inventory

IPv4 prefixes

1 announced · 512 addresses

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Prefix	Addresses	Country	RPKI	IRR	Flags
216.21.18.0/23	512	US	—	—

asn.dev is an explorer for autonomous systems: address space, network context, observed peering topology, and a full dossier on any address.

v0.19.0 · built 2026-10-20T12:05:08Z

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