AS19977 MBRML-AS - Mayer Brown LLP

🇺🇸

ARINassigned

Announced Prefixes (BGP)

10total

10 IPv40 IPv6

IPv4 Addresses

Allocated (RIR)16,384

Announced (BGP)4,096

IPv6 Addresses

Allocated (RIR)0

Announced (BGP)0

Prefix Limit (IPv4)

Prefix Limit (IPv6)

Country

RIR

Status

assigned

Allocated

2016-08-02

Announced Prefixes

(BGP)10

Prefix	RPKI	IRR	Last Seen
143.58.0.0/22	Valid	ARIN	2026-10-11
143.58.0.0/24	Valid	ARIN	2026-10-11
143.58.1.0/24	Valid	ARIN	2026-10-11
143.58.2.0/24	Valid	ARIN	2026-10-11
143.58.3.0/24	Valid	ARIN	2026-10-11
143.58.4.0/22	Valid	ARIN	2026-10-11
143.58.4.0/24	Valid	ARIN	2026-10-11
143.58.5.0/24	Valid	ARIN	2026-10-11
143.58.6.0/24	Valid	ARIN	2026-10-11
143.58.7.0/24	Valid	ARIN	2026-10-11

(RIR)1

Prefix	Country	RIR	Status
143.58.0.0/18	🇺🇸 US	ARIN	allocated

(seen in AS paths)

Networks AS19977 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 AS19977 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/19977" | jq