AS12156
City of Aurora Colorado
Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Government allocation +8
- Trust score 73 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 205.167.144.0/23 | 512 |
0.0%
|
City of Aurora Colorado | US | — | — |
| 192.78.99.0/24 | 256 |
0.0%
|
City of Aurora Colorado | US | — | — |
| 198.148.209.0/24 | 256 |
1.6%
|
City of Aurora Colorado | US | — | — |
| 198.199.187.0/24 | 256 |
74.6%
|
City of Aurora Colorado | US | — | — |
| 198.199.188.0/24 | 256 |
74.2%
|
City of Aurora Colorado | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS12156 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 192.78.99.0/24 | 30,756 | 2026-08-03 15:50:38 |
| 198.199.188.0/24 | 30,631 | 2026-08-03 15:50:38 |
| 198.199.187.0/24 | 30,574 | 2026-08-03 15:50:38 |
| 198.148.209.0/24 | 14,354 | 2026-08-03 15:59:48 |
| 205.167.144.0/23 | 14,216 | 2026-08-03 15:59:48 |
| 205.167.144.0/24 | 5,944 | 2026-08-03 15:18:33 |
Frequently Asked Questions
What is AS12156?
AS12156 is an Autonomous System Number assigned to City of Aurora Colorado. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS12156 announce?
AS12156 announces 1.5K IPv4 addresses distributed across 5 routed CIDR prefixes. The network is registered in United States.
Who operates AS12156?
AS12156 is operated by City of Aurora Colorado. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS12156 registered in?
AS12156 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
