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An asset search platform such as ZoomEye can show that an internet-facing address appears to offer a service on TCP port 44818, the port the Internet Assigned Numbers Authority (IANA) registers for EtherNet/IP messaging. That result is a lead for your own exposure review. It is not proof that the host is a controller, that it is reachable right now, or that it is vulnerable. For an asset owner, the useful outcome is an inventory check: confirm whether each indexed address belongs to you, decide whether it needs public access, and close the exposure if it does not.
Why port 44818 is the starting clue
IANA’s service registry assigns TCP port 44818 to EtherNet/IP messaging, the explicit-messaging channel used by EtherNet/IP devices. A device that answers on that port is probably speaking EtherNet/IP, which is why the port is a sensible filter for an asset search. The association is strong at the protocol level but weak at the device level. Other software can listen on the same port, a firewall or port forward can make an unrelated service appear to sit behind it, and a search index can record an address that no longer serves anything.
What an asset search result contains
Search platforms index observations. ZoomEye’s Python package documentation, which is a third-party client description rather than ZoomEye’s own platform documentation, describes results that carry the IP address, port, service, country, application, and banner. Use that description to understand the general model: each record is a snapshot of what the platform saw at some point, labeled by a classifier. It does not describe current ZoomEye syntax or coverage, so confirm field names in the live interface before you build a workflow around them.
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|---|---|---|
| Port 44818 recorded | The address answered on the port IANA associates with EtherNet/IP messaging at the observation time | That the host is a PLC or other controller, or that the port is reachable today |
| Service label “ethernet-ip” (or similar) | The platform’s classifier matched the response to EtherNet/IP | Device identity; classifiers can misfire, and labels can come from a proxy or intermediary |
| Banner or application string | What the responder reported when it was observed | Model, firmware version, or whether a known vulnerability applies |
| Observation timestamp | When the index last saw the address, if the interface shows it | Current exposure; a stale record can describe a host that has since been moved or closed |
| Result count for a query | How many records matched that query at that time | A global population of exposed controllers |
Running the search safely
- Confirm authorization and scope first. Limit the work to address ranges and assets your organization owns or is contracted to assess, and get written approval that covers the search and any follow-up. Treat the search itself as passive discovery.
- Check the query syntax in ZoomEye’s current interface. A third-party DEV Community article by the author onaeiuspkz (2026) shows the example query
port="44818" && service="ethernet-ip". Treat it as an example from that article. Open the platform’s search help, confirm the field names, and adjust the query if they differ. - Narrow to your own footprint. Where the interface supports filtering by organization, netblock, or asset identifier, apply it so that results outside your scope never reach your working notes.
- Record each result as a lead. Capture the IP address, port, service label, any banner or application string, country, the observation time if shown, and the query and date you ran. Keep the raw export; you will need it when results change.
- Match each address to your records. Compare results against your asset inventory, firewall and NAT configuration, and cloud or colocation records. Use the decision table below to choose the next action.
- Do not interact with addresses you cannot account for. Do not connect to, enumerate, or send traffic to hosts outside your authorization. Escalate unexplained results to the network or owner team that controls the address space.
Turning a result into a decision
| What you see | Likely meaning | Next step |
|---|---|---|
| Address is in your inventory, port 44818 and EtherNet/IP label match, and the owner confirms it is a control-system device | A confirmed exposure candidate | Ask the OT owner whether public access is operationally required, then follow the reduction steps below |
| Address is in your inventory, but the owner says it should not be reachable from the internet | A misconfiguration, such as a forgotten port forward, cloud rule, or NAT entry | Remove or restrict the path, then verify from your own firewall logs and configuration that the rule is gone |
| Address is not in your inventory | Possibly a third-party host, a retired address, or an address your organization no longer controls | Escalate to the network team and the address-space owner; do not probe it |
| Port 44818 is recorded without an EtherNet/IP label, or the label looks wrong | Misclassification, or a different service on the same port | Check the owner’s records for what runs on that address before treating it as an EtherNet/IP asset |
| Results change between runs | Normal for an index that is refreshed over time | Keep the timestamp with each record and reassess on a schedule rather than trusting a single run |
Reducing exposure on systems you own
CISA’s exposure-reduction guidance, published June 4, 2025, sets out a sequence that fits this workflow. Apply it to the assets you have confirmed in your own scope.
- Identify every internet-accessible asset. Build the list from your inventory and the search results together, since neither alone is complete.
- Decide which exposures are operationally necessary. Ask the OT owner whether each one must be reachable from outside the network. Document the answer and the reason.
- Restrict or remove what is not necessary. Remove the port forward, public IP mapping, or cloud rule, or limit it to specific trusted sources. Coordinate timing with OT operations so that the change does not interrupt process control.
- Protect the exposure that remains. Work through the subsections below.
- Reassess routinely. Internet-facing assets and index observations change, so repeat the discovery and inventory check on a set schedule.
Access that must stay open
- Change default passwords on every device and service that accepts them.
- Patch supported systems to vendor-supplied versions, following the owner’s change process.
- Route remote access through a secured jump host with session logging and monitoring, not direct connections to the controller.
- Monitor traffic to and from the exposed interface and alert on unexpected sources.
- Require multi-factor authentication for remote access wherever the platform supports it.
Keeping control networks isolated
CISA’s industrial control systems advisory recommends keeping control-system devices off the public internet. Place control networks and remote devices behind firewalls, and isolate them from business networks. This is the structural fix: a search result that keeps reappearing usually means the architecture, not just one rule, needs review. Because control systems carry performance, reliability, and safety requirements that differ from office IT, as NIST Special Publication 800-82 Revision 2 explains, make these changes with the OT team rather than as a unilateral IT change.
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Reading the result count you may see
A DEV Community article by onaeiuspkz (2026) reports a ZoomEye result count of 41,601 for a query of this kind, with an observation timestamp of 2026-09-17 05:39. That figure reflects one platform, one query, and one moment, and it is reported by a third-party author. It is not a verified count of internet-reachable controllers, and it is not a current prevalence figure. Do not use it to estimate how many EtherNet/IP devices are exposed worldwide.
Standards and documentation worth knowing
ODVA, which maintains the EtherNet/IP specifications, publishes an EtherNet/IP Network Infrastructure Guide and a publication titled “Securing EtherNet/IP Networks.” Its specifications page lists the EtherNet/IP adaptation of the Common Industrial Protocol (CIP) and CIP Security, with versions current on that page as of April 2026. These documents explain the protocol and security model. Reading them is useful for design work, but it is not a prerequisite for the discovery and exposure-reduction steps above.
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Limits of this approach
- Search indexes are incomplete and do not show everything reachable on the internet. An empty result does not prove that your assets are unexposed.
- A port match does not prove that an address runs a controller, that the controller is vulnerable, or that an attacker could use it.
- Platform coverage, refresh frequency, and field reliability vary and are not documented here from first-party ZoomEye sources.
- CISA names several asset-search platforms for exposure visibility and says that listing them does not imply endorsement. Choose a platform on its own merits, and do not read CISA guidance as an endorsement of ZoomEye.
Used this way, a search result becomes a reliable input to your inventory and change process: it tells you where to look, and your own records and the owner’s confirmation tell you what is actually there.
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