Autonomous system
AS5635 GLAXOSMITHKLINE
Unclassified ARIN
Summary
GlaxoSmithKline
enterprise legacy
A corporate network of GSK (GlaxoSmithKline), the British multinational pharmaceutical and biotechnology company, registered to its US organisation in Philadelphia under the handle GLAXOSMITHKLINE.
What it's used for
- Enterprise connectivity for GSK's US operations: corporate sites, research and manufacturing facilities, and company-run internet-facing services.
Notable
- Enterprise address space, not a service provider. The AS announces a single 256-address block and exists so the company can route its own space.
- ARIN registered the AS in 1995, well inside the era when large industrial and pharmaceutical firms took address space and AS numbers directly.
Interesting
- The registrant behind the AS still carries the ARIN organisation handle
SBC-92, which appears to date from SmithKline Beecham. That company merged with Glaxo Wellcome in 2000 to form GlaxoSmithKline, five years after the AS was registered, and the old handle was never replaced.
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
1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS10753 | Level 3 Parent, LLC | 60 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-15, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1 prefixes · 256 addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 1 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS5635- Registry name
- GLAXOSMITHKLINE
- Registrant
- GlaxoSmithKline
- Abuse contact
- csir@gsk.com
- Registered
- 1995-07-18
- Last changed
- 2012-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 1 with no ROA
- ROAs
- 0 authorising AS5635
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 1 announcements
- Route objects
- 0 naming AS5635
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 1,782 prefixes, as published 2026-10-16. 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