2025-11-25: Removed access to deprecated version 1.0.
2025-11-25: API version 2.0 is fully backwards compatible.
2025-07-31: Released API version 2.0.
2025-05-01: Released API version 1.0.
The ODNS API provides access to our latest DNS scan results.
We scan the complete IPv4 address space once a week for open DNS recursive resolvers, forwarders, and transparent forwarders.
Try the API now and get insights into the threat landscape posed by the open DNS infrastructure.
If you use our data, please, cite our work: 10.1145/3485983.3494872
curl -X 'POST' \
'https://odns-data.netd.cs.tu-dresden.de/api/v2/ODNSQuery/GetDnsEntries' \
-H 'accept: text/plain' \
-H 'X-API-KEY: YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{
"pagination": {
"page": 1,
"per_page": 10
},
"filter": {
"protocol": "udp",
"queried_ip_country": "USA"
},
"sort": {
"field": "timestamp_request",
"order": "desc"
}
}'In case of questions, please, contact Maynard Koch.
We highly appreciate the contribution of Patrick Balian, who implemented the API to make our research easily accessible to anyone!
BIG thanks!
Maynard Koch PhD Student and Research Associate at TU Dresden, Chair of Distributed and Networked Systems.
Patrick Balian Master Student at TU Dresden
Implementation of the API using .NET, PostgreSQL and Python.