AS19739 — COUNTY-SANBERNARDINO

AS19739 announces 21 IPv4 prefixes covering 10,496 addresses and 0 IPv6 prefixes.

About this network

COUNTY-SANBERNARDINO is the autonomous system for the County of San Bernardino.

What it's used for

• The address space carries internal county network infrastructure, identified by the consistent netname SANBDNO across all registered prefixes.
• The AS announces 10,240 IPv4 addresses across 21 prefixes with only 3 observed neighbours, indicating a self-contained internal network rather than a transit or access provider.

Notable

• All registrants in the RDAP data are listed as "San Bernardino County," which aligns directly with the AS holder name.
• The address inventory is finely subdivided into 21 distinct prefixes, ranging from a /21 down to multiple /24s, suggesting site-by-site segmentation for different county facilities or departments.
• No IPv6 prefixes are currently announced in the inventory.

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

Announced prefixes

• 170.164.0.0/24
• 170.164.10.0/23
• 170.164.14.0/24
• 170.164.20.0/23
• 170.164.40.0/22
• 170.164.44.0/23
• 170.164.50.0/24
• 170.164.60.0/24
• 170.164.70.0/23
• 170.164.75.0/24
• 170.164.84.0/23
• 170.164.87.0/24
• 170.164.97.0/24
• 170.164.101.0/24
• 170.164.107.0/24
• 170.164.116.0/22
• 170.164.124.0/23
• 170.164.165.0/24
• 170.164.239.0/24
• 170.164.240.0/21
• 170.164.248.0/23

Upstream networks

• AS3356 Level 3 Parent, LLC
• AS5650 Frontier Communications of America, Inc.
• AS20001 Charter Communications Inc

Adjacent networks

• AS3356 Level 3 Parent, LLC
• AS5650 Frontier Communications of America, Inc.
• AS20001 Charter Communications Inc