Country
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ASN LANDING PAGE
AS27021
AS-DGX - Quest Diagnostics, Inc.
Last updated · Jul 20, 2026
Total prefixes
17
IPv4 prefixes
17
IPv6 prefixes
0
ASN summary
How to read the scale of AS27021
AS-DGX - Quest Diagnostics, Inc. currently reports 17 prefixes and 4 upstream, downstream, or peer relationships. These counts describe the current dataset; they do not by themselves prove network quality, reach, or service use.
What can an ASN page answer?
An ASN page shows the public organization label, country or region, BGP prefixes, and available peer and upstream relationships. It adds network context but cannot confirm a website host, physical facility, security status, or service quality.
How should you read the organization and region fields?
AS-DGX - Quest Diagnostics, Inc. is currently associated with an unknown region. These values come from public network sources and are useful lookup clues; an organization label, registration region, and actual service location may differ.
How should you verify the AS27021 result?
The page shows ASN data returned by the current upstream query; interpret it with the update time. Open representative IP pages from the same network and compare prefixes, source labels, and query times. Verify operator or service claims with the relevant registry or network operator.
How to verify this ASN result
AS27021 ASN lookupAS27021 BGPAS27021 peersAS27021 prefixesAS27021 upstreamsAS-DGX - Quest Diagnostics, Inc. ASN
Upstreams
Detailed data for this ASN is not available right now.
Downstreams
Detailed data for this ASN is not available right now.
Peers
Prefix inventory
| Prefix | Name | Country |
|---|---|---|
| 156.30.24.0/24 | AS27021 | — |
| 156.30.5.0/24 | AS27021 | — |
| 204.235.142.0/23 | AS27021 | — |
| 209.242.240.0/24 | AS27021 | — |
| 209.242.241.0/24 | AS27021 | — |
| 209.242.247.0/24 | AS27021 | — |
| 209.242.248.0/24 | AS27021 | — |
| 209.242.250.0/24 | AS27021 | — |
| 209.242.251.0/24 | AS27021 | — |
| 216.195.72.0/24 | AS27021 | — |
| 216.203.80.0/20 | AS27021 | — |
| 216.203.80.0/21 | AS27021 | — |
| 216.203.80.0/24 | AS27021 | — |
| 216.203.87.0/24 | AS27021 | — |
| 216.203.88.0/21 | AS27021 | — |
| 216.203.92.0/22 | AS27021 | — |
| 65.199.254.0/24 | AS27021 | — |
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Related lookups and next steps
Frequently asked questions about this ASN page
What does AS27021 represent?
AS27021 is an autonomous system number. The current source associates it with AS-DGX - Quest Diagnostics, Inc. and the region field an unknown region; those values add network context but do not prove a specific service, physical location, or quality level.
What are peers, upstreams, and prefixes useful for on the AS27021 page?
They help explain the scale, interconnection depth, and route structure of AS27021. Richer peering and upstream data often indicate broader network reach, but they should still be interpreted together with prefixes and related IP landing pages.
What should you do after reviewing AS27021?
Open a concrete IP page to check how the address maps into AS27021, then compare the prefix, source labels, and query time. Verify operator or service claims with the relevant registry or network operator.
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