AS11829 — CADENCE

AS11829 announces 6 IPv4 prefixes covering 1,536 addresses and 0 IPv6 prefixes.

About this network

CADENCE is the corporate network of Cadence Design Systems, the San Jose electronic-design-automation company whose tools are used to design chips and printed circuit boards. This is an enterprise AS, not a service provider.

What it's used for

• Internet-facing corporate infrastructure for Cadence itself. RIS sees six IPv4 prefixes carrying roughly 1,536 addresses, no IPv6, and just three observed neighbours: the shape of a company that buys transit rather than one that sells it.
• Reverse DNS on the sampled addresses lands squarely in cadence.com (hostnames such as an FTP server and a numbered internal host), so the space is serving Cadence's own systems rather than any third-party customer base.

Notable

• The prefix registrations look untidier than the network is. Only three of the six /24s register to Cadence itself; the rest sit under a legacy UUNET/Verizon Business customer block and under two other small companies. That is the ordinary residue of a long-lived enterprise inventory. Provider-assigned space and blocks inherited through corporate history are both normal here, and none of the usual leasing tells are present: everything is ARIN space, the routing is first-party, and the rDNS is Cadence's own.

Interesting

• Address counts this small are typical of large software firms. The bulk of a company like Cadence's compute now sits behind cloud and SaaS providers, so the AS it announces reflects its edge, not its size.

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

Announced prefixes

• 158.140.1.0/24
• 158.140.2.0/24
• 158.140.5.0/24
• 192.190.239.0/24
• 192.203.56.0/24
• 199.43.4.0/24

Upstream networks

• AS33667 Comcast Cable Communications, LLC
• AS3356 Level 3 Parent, LLC
• AS33651 Comcast Cable Communications, LLC
• AS701 Verizon Business

Adjacent networks

• AS33667 Comcast Cable Communications, LLC
• AS3356 Level 3 Parent, LLC
• AS33651 Comcast Cable Communications, LLC
• AS701 Verizon Business