Network Overview
| ASN | AS19739 |
| Organization | County of San Bernardino |
| Announced IPv4 ranges | 18 |
| Total IPv4 addresses | 10,496 |
Sample IP Ranges Announced by AS19739
| Range Start | Range End | Lookup |
|---|---|---|
170.164.0.0 |
170.164.0.255 |
Details → |
170.164.10.0 |
170.164.11.255 |
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170.164.14.0 |
170.164.14.255 |
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170.164.20.0 |
170.164.21.255 |
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170.164.40.0 |
170.164.45.255 |
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170.164.50.0 |
170.164.50.255 |
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What Is an Autonomous System?
An autonomous system (AS) is a collection of IP networks operated by a single organization - an ISP, cloud provider, enterprise, or university - that shares a common routing policy. Each AS is identified by a unique AS number (ASN) and exchanges routing information with other systems using the BGP protocol.
Knowing which ASN an IP belongs to reveals who actually operates the network behind it - useful for fraud analysis, traffic quality assessment, and abuse investigation. Use the IP lookup tool to find the ASN for any address.
Frequently Asked Questions
What is AS19739?
AS19739 is the autonomous system operated by County of San Bernardino, announcing 18 IPv4 ranges (10,496 addresses).
Who operates AS19739?
County of San Bernardino. An autonomous system is a network under a single administrative entity that exchanges routes with other networks via BGP.
How do I check if an IP belongs to AS19739?
Enter the IP into our free IP lookup - the result shows the ASN, operator, geolocation, and VPN/datacenter flags.
How many IP addresses does AS19739 have?
AS19739 currently announces approximately 10,496 IPv4 addresses across 18 ranges, according to public routing data.