Autonomous system
AS25878 QNST-DC01
Unclassified ARIN
Summary
QuinStreet
business marketing corporate
The AS handle QNST-DC01 is held by QuinStreet, Inc.
What it's used for
- The address space carries corporate infrastructure for an online marketing company, evidenced by registrant netnames like
INAP-SFO-QUINSTREET-10878andXOXO-67-106-145-0, and reverse DNS entries such asmail-163-64.neoquin.comand126-41.84.64.qds-i.net. - The AS announces 2560 IPv4 addresses across 7 prefixes and maintains 8 observed neighbours, a ratio consistent with an internal corporate estate rather than a transit or access network.
Notable
- Registrants across the inventory consistently identify as QuinStreet or Quinstreet, Inc., aligning with the AS holder.
- QuinStreet is a publicly traded online marketing company based in Foster City, California, that helps generate web traffic for clients.
- The inventory consists of seven IPv4 prefixes with no IPv6 prefixes, showing a finely subdivided corporate address space.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
8 upstream, 0 downstream and 8 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-20, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 7 prefixes · 2.56K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 7 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS25878- Registry name
- QNST-DC01
- Registrant
- Quinstreet, Inc.
- Abuse contact
- neteng@quinstreet.com
- Registered
- 2007-10-22
- Last changed
- 2012-02-24
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 7 with no ROA
- ROAs
- 0 authorising AS25878
- ASPA
- no ASPA record
- IRR
- 100% registered · 7 of 7 announcements
- Route objects
- 9 naming AS25878
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,779 prefixes, as published 2026-10-21. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere