AS16503 ZAYO-16503 - Zayo Bandwidth

🇺🇸

ARINassigned

Announced Prefixes (BGP)

4total

4 IPv40 IPv6

IPv4 Addresses

Allocated (RIR)20,480

Announced (BGP)20,736

IPv6 Addresses

Allocated (RIR)0

Announced (BGP)0

Prefix Limit (IPv4)

Prefix Limit (IPv6)

Country

RIR

Status

assigned

Allocated

2000-05-04

Announced Prefixes

(BGP)4

Prefix	RPKI	IRR	Last Seen
64.20.96.0/19	Valid	Other IRR	2026-10-09
64.124.127.0/24	Valid	-	2026-10-09
66.45.192.0/19	Valid	Other IRR	2026-10-09
216.178.48.0/20	Valid	Other IRR	2026-10-09

(RIR)3

Prefix	Country	RIR	Status
64.20.96.0/19	🇺🇸 US	ARIN	allocated
66.45.192.0/19	🇺🇸 US	ARIN	allocated
216.178.48.0/20	🇺🇸 US	ARIN	allocated

(seen in AS paths)

Networks AS16503 hands its own prefixes to: transit providers, or peers at an exchange.

Registry transfers of AS16503 between organisations.

Date	Resource	From	To	Type
2016-09-07	AS16503	Northwest Telephone, Inc. 🇺🇸 US ARIN	Zayo Bandwidth Inc 🇺🇸 US ARIN	M&A

ASPA

No ASPA

External Links

What is an ASN?Autonomous systems, ASN ranges and how they are assigned
RPKI and route origin validationWhat the RPKI badges on the prefix list mean
ASPA explainedWhy AS16503 should publish an ASPA object
IPv4 transfers in the ARIN regionMonthly volume and the latest registry transfers
ASN data in AI agents and SIEMMCP server and API integrations

API

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/16503" | jq