asn.dev

Autonomous system

AS11528 PHOTRONICS

Unclassified ARIN

IPv4 addresses 2.56K 7 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 8 0 downstream
Flagged prefixes 0 none

Summary

Photronics Inc.

United States · AI-generated

enterprise legacy

PHOTRONICS is Photronics Inc., a manufacturer of photomasks — the master templates used to print circuit patterns onto semiconductor wafers and flat-panel displays. The AS carries the company's own corporate network.

What it's used for

  • Enterprise connectivity for a global manufacturer: corporate systems, mail, and the customer-facing portals through which chip designers submit mask data to the fabs.
  • RIS sees 10 announced IPv4 prefixes totalling 2,560 addresses, no IPv6, and 8 observed BGP neighbours. Every announcement is a /24. Eight neighbours is more than a single-site enterprise usually needs but nowhere near carrier scale, and it fits a company with manufacturing sites on several continents, each taking local transit while announcing space from the same AS.

Notable

  • Reverse DNS is sparse but first-party and consistent: mailfrom.photronics.com appears on three different blocks (206.220.70.0/24, 198.61.5.0/24, and 199.36.7.0/24), and one host answers as portal-old.photronics.com. Outbound mail relays spread across separate prefixes, plus a superseded customer portal still holding an address, is the ordinary texture of a long-lived corporate network rather than anything hosted or leased.
  • All prefixes register to Photronics Inc. Holder and registrant agree throughout, so the inventory is self-held despite being scattered across 199.36.x, 206.220.x, 198.61.x, and a 192.129.97.0/24 from the old Class C swamp.

Interesting

  • Two ARIN netblock handles are worth a second look. NETBLK-PLABMIL sounds like it could be military space, and it is not: PLAB is Photronics' stock ticker, and the handle is an internal site code on a block whose registered org is plainly Photronics Inc. Handles are frequently internal shorthand that names nobody, and reading them as words is how classifications go wrong. The org field, not the handle, is the thing to trust.

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

Full topology · Graph

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.

ASNetworkPaths seen
AS174Cogent Communications, LLC174
AS17408AboveNet Communications Taiwan64
AS4766Korea Telecom61
AS3462Data Communication Business Group60
AS15372IBH connect GmbH60
AS2856British Telecommunications Limited59
AS7385Allstream Business US, LLC59
AS42973Convergence Group (Wireless) Networks Limited59

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 7 prefixes · 2.56K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America7

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS11528
Registry name
PHOTRONICS
Registrant
Photronics Inc.
Abuse contact
corpnet@photronics.com
Registered
1998-09-17
Last changed
2012-02-24
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
10% valid · 1 valid, 9 with no ROA
ROAs
1 authorising AS11528
ASPA
no ASPA record
IRR
100% registered · 10 of 10 announcements
Route objects
23 naming AS11528

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 1,772 prefixes, as published 2026-10-15. 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

Cross-check