AS393456 X - United States Steel Corporation

🇺🇸

ARINassigned

Announced Prefixes (BGP)

4total

4 IPv40 IPv6

IPv4 Addresses

Allocated (RIR)112,896

Announced (BGP)1,024

IPv6 Addresses

Allocated (RIR)0

Announced (BGP)0

Prefix Limit (IPv4)

200

Prefix Limit (IPv6)

Country

RIR

Status

assigned

Allocated

2014-05-27

Announced Prefixes

(BGP)4

Prefix	RPKI	IRR	Last Seen
170.4.0.0/24	No ROA	-	2026-10-11
170.191.0.0/24	No ROA	-	2026-10-11
170.191.2.0/24	No ROA	-	2026-10-11
199.248.185.0/24	No ROA	-	2026-10-11

(RIR)8

Prefix	Country	RIR	Status
170.4.0.0/19	🇺🇸 US	ARIN	allocated
170.4.64.0/18	🇺🇸 US	ARIN	allocated
170.4.128.0/19	🇺🇸 US	ARIN	allocated
170.4.160.0/21	🇺🇸 US	ARIN	allocated
170.4.208.0/20	🇺🇸 US	ARIN	allocated
170.4.224.0/19	🇺🇸 US	ARIN	allocated
170.191.0.0/16	🇺🇸 US	ARIN	allocated
199.248.185.0/24	🇺🇸 US	ARIN	allocated

(seen in AS paths)

Networks AS393456 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 AS393456 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/393456" | jq