AS20234 — HNTB

AS20234 announces 6 IPv4 prefixes covering 2,560 addresses and 0 IPv6 prefixes.

About this network

The AS handle HNTB is held by HNTB Corporation, an American architectural and infrastructure design firm.

What it's used for

• The address space is registered under netnames NETBLK-HNTB and NETBLK-HNTB2, indicating a corporate internal network rather than a public service provider.
• The AS announces 2560 IPv4 addresses across 6 prefixes with only 3 observed neighbours, a ratio consistent with a private corporate estate with limited external peering.

Notable

• All registrants in the RDAP data are listed as HNTB Corporation, matching the AS holder.
• HNTB is a major engineering and design firm, not a telecommunications carrier, explaining the lack of consumer-facing reverse DNS records.
• The inventory consists of two /23 blocks and two /24 blocks in the 198.51 and 198.99 ranges, all located in the United States.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 198.51.225.0/24
• 198.51.226.0/23
• 198.51.228.0/23
• 198.99.250.0/23
• 198.99.252.0/23
• 198.99.254.0/24

Upstream networks

• AS174 Cogent Communications, LLC
• AS15164 Unite Private Networks LLC.
• AS3356 Level 3 Parent, LLC

Adjacent networks

• AS174 Cogent Communications, LLC
• AS15164 Unite Private Networks LLC.
• AS3356 Level 3 Parent, LLC

Routing security

• RPKI: 0 valid, 0 invalid and 6 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 9 route objects.
• Listed in as-sets: AS-F5, AS-HURRICANE, AS-RR-BIZ, AS-TRANSROUTE-SPEC, AS15164:AS-CUSTOMERS, AS35280:AS-F5.