Shodan Alternatives in 2026: 8 Tools Compared

#1

Censys

Best for: Closest direct Shodan replacement

Visit censys.com

Censys suits a reader who wants Shodan style answers with more structure and fresher data. You can search by IP, domain, certificate, service banner, software version, and many other fields, then pivot from a certificate to every host that serves it, or from an IP to its history. That pivot ability is where Censys pulls ahead of a simple banner search: one finding becomes a map of related infrastructure.

Censys also works well as an exposure management tool for your own organization. Connect your domains and IP ranges, track what appears, and get alerts when a new service shows up. The limit is cost transparency. Censys does not publish a single simple price for every use case, so check the current pricing page and any free tier before you build a workflow around it. For research and small scale use, start with a free account and a narrow query, then scale only after you know your monthly query volume.

#2

FOFA

Best for: Web fingerprint and asset search in Asia and beyond

Visit fofa.info

FOFA suits researchers and defenders who need a second view of the internet, especially for web assets that other scanners index less well. Its fingerprint approach identifies applications, frameworks, and devices from response headers, page content, and other signals, which helps when you are hunting for a specific technology across many hosts. That makes it useful for tracking exposure of a widely used product after a vulnerability is disclosed.

The main drawback is usability for English only readers. Much of the site and community material is in Chinese, and the homepage fetch in this review returned only minimal text, which reflects how much of FOFA loads through its search interface rather than a marketing page. If you plan to use FOFA regularly, budget time to learn its query syntax and to verify free query limits on the current pricing page.

#3

GreyNoise

Best for: Separating malicious scanning from background noise

4.8/5 on G2 (129 reviews, checked Oct 2026)

Visit greynoise.io

GreyNoise suits a SOC analyst who is tired of treating every scan alert as equal. Instead of asking what is open on the internet, GreyNoise asks who is scanning, what they are trying to exploit, and whether that activity is known benign research, opportunistic mass scanning, or targeted exploitation. That context lets a team block a malicious IP quickly while ignoring a known research scanner, which cuts alert volume in a useful way.

GreyNoise is therefore a complement to Shodan, rather than a drop in replacement. You would still use Censys or FOFA to find your exposed assets, then use GreyNoise to judge whether an IP probing those assets is a real threat. Check the current pricing page for community and commercial tiers, since free access is more limited than a full feed. If your main job is asset discovery, start elsewhere on this list. If your main job is triage, GreyNoise belongs near the top.

#4

Criminal IP

Best for: Threat hunting with IP, domain, and vulnerability context

Visit criminalip.io

Criminal IP suits a threat hunter who wants a Shodan style search enriched with threat context. A single IP lookup can show open ports and services, associated domains, abuse history, malware associations, and vulnerability signals, which helps an analyst decide whether an address is part of a campaign or just a noisy host. Its attack surface monitoring adds ongoing value: once you define your assets, it watches for new exposures instead of waiting for a manual search.

The trade off is breadth. Criminal IP covers search, asset discovery, fraud detection, and dark web monitoring, which means a buyer should check which modules are included in a given plan. A solo researcher may only need the search engine, while a SOC may want monitoring and feeds as well. Confirm the current free tier and paid tiers on the vendor site, and test a set of known IPs during a trial to judge data accuracy for your region and industry.

#5

Netlas

Best for: Response search and attack surface mapping on a budget

Visit netlas.io

Netlas suits a penetration tester, bug bounty hunter, or small security team that needs strong search without an enterprise budget. Its free account, listed on its homepage as up to 50 requests per day, is enough for many focused investigations, and its response search is a standout: you can search the content of HTTP responses, not only headers and banners, which helps find exposed configuration files, test pages, and specific application strings.

Netlas also offers an attack surface discovery tool that links domains, IPs, services, and certificates into a map, plus a full API and Python SDK for automation. That combination makes it a practical daily tool, not only a web search box. The limit is scale and support: a large enterprise with strict procurement and support requirements may prefer Censys or SOCRadar, while a small team will likely find Netlas the best value on this list. Confirm current free limits on the site, since free tiers change.

#6

LeakIX

Best for: Finding exposed services and leaked data patterns

Visit leakix.net

LeakIX suits a researcher who wants a fast, focused answer to a simple question: what is exposed, and where. Its search syntax covers IP ranges, ports, protocols, and autonomous system numbers, and its history of indexing databases and services makes it useful for hunting misconfigured storage, open admin panels, and other classic exposures. The homepage itself is a search box, which tells you a lot about its design: it is built for searching first.

That focus is also its limit. LeakIX does not offer the same enterprise monitoring, ticketing, and reporting suite as Censys or SOCRadar, and its index is smaller. Use it as a second opinion alongside a larger scanner, especially when you are checking a specific exposure pattern. As with every tool here, only investigate assets you own or have permission to test, and treat a LeakIX result as a lead to verify, not as proof of a vulnerability.

#7

ONYPHE

Best for: Internet mapping for threat intelligence analysts

Visit onyphe.io

ONYPHE suits a cyber threat intelligence analyst who tracks adversary infrastructure over time. Its weekly full internet scans, plus more frequent scans of the most commonly attacked ports, give a current picture of what is exposed, while its passive DNS history lets an analyst reconstruct how a domain or IP was used in the past. Vulnerability checks focus on flaws that are actively exploited, which keeps the signal relevant for threat work.

ONYPHE also binds assets to domains, not only IPs, which helps when an adversary moves infrastructure between addresses. That domain centric view is useful for tracking campaigns, phishing sites, and command and control nodes. The main drawback is price transparency: full dataset access is quoted, so a small team should ask what partial or API access costs before committing. For pure asset discovery, Censys or Netlas may be simpler. For infrastructure tracking, ONYPHE earns its place.

#8

SOCRadar

Best for: Attack surface plus dark web and credential monitoring

4.7/5 on G2 (121 reviews, checked Oct 2026)

Visit socradar.io

SOCRadar suits a SOC team that wants internet exposure data inside a wider threat intelligence workflow. Its attack surface features cover digital footprint discovery, asset monitoring, certificate monitoring, and critical port detection, while its threat intelligence side adds dark web monitoring, leaked credential detection, stealer log tracking, and ransomware group tracking. That combination means a single alert can link an exposed service to a leaked credential or a ransomware mention, which is harder to do with a scanner alone.

The trade off is focus. If you only need to search for open ports and banners, SOCRadar is more product than you need, and a dedicated scanner will be cheaper and simpler. If you run a SOC and already buy threat intelligence feeds, SOCRadar can replace several point tools at once. Confirm which modules are included in a quote, since its platform spans threat hunting, brand protection, and supply chain intelligence, and not every buyer needs all of them.