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Company record · security vendor

GreyNoise

CISO Tribune company record: GreyNoise, security vendor (Threat intelligence)

Where GreyNoise appears on the record (48)

Every page on CISO Tribune and its network that carries this company, 48 in all.

Compared with (45)

vs Acalvio, vs Alphabet, vs Anomali, vs Bitsight, vs Censys, vs Charm Security, vs CounterCraft, vs Cyble, vs CYPFER, vs Cyrenity, vs Cyware, vs Dataminr, vs DeepSeas, vs EasyDMARC, vs EclecticIQ, vs Filigran, vs Flare, vs Flashpoint, vs General Dynamics Information Technology, vs Group-IB, vs Hold Security, LLC, vs Indra Group, vs Intel 471, vs Intezer, vs iVerify, vs Kai, vs Keepnet Labs, vs Leonardo, vs Mate Security, vs Mave, vs Nucleus Security, vs Overwatch, vs Parsons, vs Peraton, vs QuoIntelligence, vs Recorded Future, vs Red Canary, vs REDLattice, vs SecurityScorecard, vs SOCRadar, vs Surefire Cyber, vs ThreatConnect, vs VulnCheck, vs White Hat IT Security, vs ZeroFox

In the vendor directory (3)

What the company sells

GreyNoise sells real-time network threat intelligence built on traffic it observes at the network edge. GreyNoise says it watches and analyzes malicious edge traffic in real-time, so customers can block novel exploitation, catch compromised devices, and investigate critical alerts as they happen.

GreyNoise describes its platform as a single place to investigate any IP or CVE, catch threats hitting the edge, and turn intelligence into automated action. On the platform, users can investigate, enrich, and search GreyNoise's view of the whole internet, for one IP or thousands. GreyNoise says its platform returns a first-hand verdict of malicious, benign, or suspicious for any IP looked up.

GreyNoise says a global grid of thousands of sensors observes attackers first-hand. Customers can also deploy GreyNoise sensors that impersonate vulnerable software to draw out attackers, then capture and analyze every packet. GreyNoise says Session Explorer delivers packet-level forensics and full PCAP export across sensor traffic.

For action, GreyNoise says dynamic blocklists turn any GNQL query into a live, API-authenticated URL that any firewall or WAF can ingest. Feeds and alerts stream chosen events to a SIEM, SOAR, email, or webhook in real time. GreyNoise says 80+ integrations push its intelligence into SIEM, SOAR, TIP, firewalls, and agentic SOC tools.

GreyNoise describes several use cases. For alert reduction, GreyNoise says it reduces alert fatigue by classifying IPs as benign, malicious, or suspicious. For threat hunting, GreyNoise says it filters out opportunistic probes, benign scanners, and botnet noise to reveal statistically significant anomalies that represent targeted attacks. For vulnerability prioritization, GreyNoise says that, unlike static severity and probability scores, it supplies real-time, primary-sourced intelligence on attacks it sees in-the-wild.

GreyNoise also addresses early warning and compromised devices. GreyNoise says its research shows that spikes in traffic targeting older CVEs often precede new CVE disclosures for that same vendor within weeks. For compromised assets, GreyNoise says it uses two signals: an IP that shows up as a scanner in GreyNoise, and outbound traffic that matches a confirmed callback IP. For investigations, GreyNoise says it adds context on IPs and CVEs seen in mass scanning and exploitation campaigns, which speeds triage and reduces manual work.

GreyNoise Block is labelled as being for small and mid-sized teams. GreyNoise Block turns primary-source edge intelligence from the Global Observation Grid into precision blocklists for firewalls. GreyNoise says blocklists deploy as standard External Dynamic Lists over HTTPS and refresh every hour. GreyNoise says GreyNoise Block is ideal for organizations with less than 2,500 employees, while organizations with more than 2,500 employees or MSSPs are pointed to the full GreyNoise platform. A 14-day free trial is offered for GreyNoise Block.

GreyNoise also offers versions of its message for government and enterprise audiences. GreyNoise says it gives enterprise SOCs real-time edge intelligence inside the tools they already run. GreyNoise says it turns edge reconnaissance and exploitation into early warning signals for national defense operators.[1][2][3][4][5][6][7][8][9][10][11][12]

Categories
Headquarters
Washington, United States
Founded
Not established from our sources
Ownership
Not established from our sources
CISO on record
Not yet on our record. Send a verified source
Website
greynoise.io

Products and services

Product names as the company writes them; what each does, in our words, from the company's own product pages. Never how well it does it.

  • GreyNoise Block[5][11]

    Real-time blocklists for firewalls, labelled as being for small and mid-sized teams.

    GreyNoise Block turns primary-source edge intelligence from the Global Observation Grid into blocklists for firewalls. Blocklists deploy as standard External Dynamic Lists over HTTPS. GreyNoise says lists refresh every hour. It also offers dozens of out-of-box blocklist templates.

  • GreyNoise Platform[4]

    Platform to investigate any IP or CVE, catch threats hitting the edge, and turn intelligence into automated action.

    GreyNoise says its platform lets users investigate, enrich, and search GreyNoise's view of the whole internet, for one IP or thousands. Dynamic blocklists turn any GNQL query into a live, API-authenticated URL any firewall or WAF can ingest. Feeds and alerts stream events to a SIEM, SOAR, email, or webhook in real time.

Competitors and alternatives

The other companies on our record filed under the same categories, category by category: first those that lead with that category and share more of GreyNoise's categories, then alphabetical. A list from the record, never a ranking.

What review platforms show

The headline rating and review count each platform showed in public search results on the day we looked, with the link. We do not read or reproduce the reviews, and a rating is the platform's, not ours.

  • G2 · 4.8 out of 5[13]seen November 5, 2026

References

Every fact above cites one of these by number. Tier A is the company itself, a regulator or a filing; tier B is trade or business press.

  1. [1]Greynoise raises 15 million in series a funding to fight cyber distractions and mass vulnerability exploitationGreyNoise · greynoise.io · published June 15, 2022 · Tier A: the company, a regulator or a filing
  2. [2]ContactGreyNoise · greynoise.io · undated page, accessed September 27, 2026 · Tier A: the company, a regulator or a filing
  3. [3]GreyNoise | Real-Time Network Threat IntelligenceGreyNoise · undated page, accessed October 25, 2026 · Tier A: the company, a regulator or a filing
  4. [4]GreyNoise Platform | Detect, Investigate & Respond FasterGreyNoise · undated page, accessed October 25, 2026 · Tier A: the company, a regulator or a filing
  5. [5]GreyNoise BlockGreyNoise · undated page, accessed October 25, 2026 · Tier A: the company, a regulator or a filing
  6. [6]Early Warning Signs of CVEs | GreyNoise IntelligenceGreyNoise · undated page, accessed October 25, 2026 · Tier A: the company, a regulator or a filing
  7. [7]Threat Hunting | GreyNoise IntelligenceGreyNoise · undated page, accessed October 25, 2026 · Tier A: the company, a regulator or a filing
  8. [8]SOC Efficiency | GreyNoise IntelligenceGreyNoise · undated page, accessed October 25, 2026 · Tier A: the company, a regulator or a filing
  9. [9]Vulnerability Prioritization | GreyNoise IntelligenceGreyNoise · undated page, accessed October 25, 2026 · Tier A: the company, a regulator or a filing
  10. [10]Incident Investigation | GreyNoise IntelligenceGreyNoise · undated page, accessed October 25, 2026 · Tier A: the company, a regulator or a filing
  11. [11]Pricing - Request a quote | GreyNoise BlockGreyNoise · undated page, accessed October 25, 2026 · Tier A: the company, a regulator or a filing
  12. [12]Compromised Asset Detection | GreyNoise IntelligenceGreyNoise · undated page, accessed November 5, 2026 · Tier A: the company, a regulator or a filing
  13. [13]GreyNoise Reviews 2026: Details, Pricing, & Features - G2G2 · undated page, accessed November 5, 2026 · Tier C

Last verified September 27, 2026. Our code found the quoted passage behind each fact on its source page when the fact was recorded, and re-checks every record against its sources each month.

Recorded September 27, 2026, expanded November 5, 2026 from the references above.

Work for GreyNoise? Suggest a correction to a fact on this page (with a source on your own domain), or claim this entry by publishing a small file on your domain.

Security leadership

CISO Tribune has not yet recorded who holds the top security seat at GreyNoise. We add a seat only from a verified source; if you have one, send it to the desk.

Questions CISOs ask about GreyNoise

What does GreyNoise sell?
GreyNoise sells GreyNoise Block and GreyNoise Platform. GreyNoise Block: Real-time blocklists for firewalls, labelled as being for small and mid-sized teams. GreyNoise Platform: Platform to investigate any IP or CVE, catch threats hitting the edge, and turn intelligence into automated action.
Who does GreyNoise fit?
From its own pages, GreyNoise sells to enterprise SOCs and to government and national defense operators, with the full platform aimed at organizations of more than 2,500 employees and MSSPs. GreyNoise Block is labelled as being for small and mid-sized teams, and GreyNoise calls it ideal for organizations with fewer than 2,500 employees. GreyNoise says its intelligence plugs into SIEM, SOAR, TIP, and firewall tools that security teams already run. GreyNoise also describes threat hunting teams and vulnerability management teams as users.
How does CISO Tribune file GreyNoise?
CISO Tribune files GreyNoise under Threat intelligence.
Where is GreyNoise headquartered?
GreyNoise is headquartered in Washington, United States.

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