{
  "id": 9427627,
  "title": "161,907 Hosts on Port 102 and 173 Siemens S7 Fingerprints: Reading Two Numbers From the Same Internet",
  "url": "https://urgent.news/2026/09/23/161-907-hosts-on-port-102-and-173-siemens-s7-fingerprints-reading-two",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-09-23T21:40:11.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/bianliang/161907-hosts-on-port-102-and-173-siemens-s7-fingerprints-reading-two-numbers-from-the-same-55il"
  },
  "original_language": "en",
  "account": "Two internet-wide queries reveal 161,907 and 173 Siemens S7 fingerprints, a stark discrepancy by three orders of magnitude. The first query, port= 102, counts the number of hosts reachable on TCP port 102, which is the ISO-TSAP transport used by Siemens S7comm. However, it is not exclusive to Siemens S7. The second query, device= plc, counts programmable logic controllers (PLCs) classified by the dataset, which is broader than a single vendor. The third query, app= Siemens S7, counts only assets positively identified as Siemens S7 products. The key distinction is that port reachability is not product identity, and product identity is not vulnerability. A CISA advisory highlights that internet-reachable Siemens S7 PLCs have been exploited. The port count informs scoping, while the device-class count estimates the PLC population. The product fingerprint confirms specific product identification. For a credible industrial exposure assessment, each query should be run separately, and results reconciled against asset registers.",
  "summary": "161,907 Hosts on Port 102 and 173 Siemens S7 Fingerprints: Reading Two Numbers From the Same Internet Two queries run minutes apart against the same internet-wide dataset return 161,907 and 173. Both describe Siemens S7 exposure. Neither is wrong. Understanding why they differ by three orders of magnitude is the difference between a defensible exposure assessment and a number that collapses under…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}