AS27021
Quest Diagnostics, Inc.
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
- Trust score 65 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS27021 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 |
|---|---|---|
| 209.242.240.0/24 | 27,746 | 2026-07-23 22:43:12 |
| 216.203.87.0/24 | 12,635 | 2026-07-23 21:26:12 |
| 209.242.247.0/24 | 10,697 | 2026-07-23 22:43:12 |
| 209.242.251.0/24 | 10,106 | 2026-07-23 22:43:12 |
| 65.199.254.0/24 | 6,788 | 2026-07-23 20:29:53 |
| 204.235.142.0/23 | 6,544 | 2026-07-23 20:29:53 |
| 216.203.80.0/21 | 6,477 | 2026-07-23 20:29:54 |
| 216.203.80.0/20 | 5,857 | 2026-07-23 20:29:54 |
| 216.203.80.0/24 | 5,774 | 2026-07-23 21:26:41 |
| 209.242.248.0/24 | 5,630 | 2026-07-23 22:43:12 |
| 209.242.250.0/24 | 5,170 | 2026-07-23 22:43:12 |
| 216.203.92.0/22 | 3,530 | 2026-07-23 20:29:54 |
| 216.203.88.0/21 | 3,526 | 2026-07-23 21:10:14 |
| 216.195.72.0/24 | 3,522 | 2026-07-23 20:29:53 |
| 209.242.241.0/24 | 3,519 | 2026-07-23 22:43:12 |
| 156.30.24.0/24 | 3,384 | 2026-07-23 21:10:14 |
| 156.30.5.0/24 | 3,316 | 2026-07-23 20:29:53 |
| 216.203.95.0/24 | 1,994 | 2026-07-22 14:54:49 |
| 216.203.85.0/24 | 1,974 | 2026-07-22 14:54:49 |
| 216.203.81.0/24 | 1,974 | 2026-07-22 14:54:49 |
| 216.203.83.0/24 | 1,972 | 2026-07-22 14:54:49 |
| 216.203.86.0/24 | 1,967 | 2026-07-22 14:54:49 |
| 216.203.84.0/24 | 1,967 | 2026-07-22 14:54:49 |
| 216.203.82.0/24 | 1,967 | 2026-07-22 14:54:49 |
Frequently Asked Questions
What is AS27021?
AS27021 is an Autonomous System Number assigned to Quest Diagnostics, Inc.. 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 AS27021 announce?
AS27021 announces 7.2K IPv4 addresses distributed across 10 routed CIDR prefixes. The network is registered in United States.
Who operates AS27021?
AS27021 is operated by Quest Diagnostics, Inc.. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS27021 registered in?
AS27021 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
