AS3557 ISC-AS - Internet Systems Consortium, Inc.

🇺🇸

ARINassigned

Announced Prefixes (BGP)

4total

2 IPv42 IPv6

IPv4 Addresses

Allocated (RIR)512

Announced (BGP)768

IPv6 Addresses

Allocated (RIR)2.4×10²⁴

Announced (BGP)3.6×10²⁴

Prefix Limit (IPv4)

Prefix Limit (IPv6)

Country

RIR

Status

assigned

Allocated

1994-04-21

Announced Prefixes

(BGP)4

Prefix	RPKI	IRR	Last Seen
192.5.4.0/23	Valid	ARINOther IRR	2026-10-11
192.5.5.0/24	Valid	ARINOther IRR	2026-10-11
2001:500:2e::/47	Valid	ARINOther IRR	2026-10-11
2001:500:2f::/48	Valid	ARINOther IRR	2026-10-11

(RIR)2

Prefix	Country	RIR	Status
192.5.4.0/23	🇺🇸 US	ARIN	allocated
2001:500:2e::/47	🇺🇸 US	ARIN	allocated

(seen in AS paths)

Networks AS3557 hands its own prefixes to: transit providers, or peers at an exchange.

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 AS3557 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/3557" | jq