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This guide is suitable for external users wanting to integrate with the public REST API for the mnemonic PassiveDNS database.
This API is available without any authentication, although with a resource limitation.

If you are a customer of mnemonic with private PDNS data, please see the PassiveDNS Integration Guide in the Argus API integration documentation for how to use PDNS with private data.

For users/organizations with a agreement, see the authentication section on how to perform authenticated queries.

Integration guideline

Simple query

To perform a simple PDNS query, use<query>?parameters

where "<query>" is a DNS query or answer string to lookup, for example

Query parameters

There are multiple query parameters that can be passed along:

ParameterPossible valuesDefault valueDescription

Limit the number of returned values.
The default value of .25 is set to avoid that a queried record with a huge resultset is streamed back to the client unecessarily.

A value of "0" means that the client explicitly requests an unlimited resultset.
If the requested resultset exceeds server resource constraints (100 000 values currently), error code 412 will be returned.


Skip the initial <offset> number of values in the resultset.

Together with the parameter "limit", this allows a client to perform pagination of the results.

rrClassAny DNS record class<any>

The most probable record class is IN.

By default, this field is not filtered.

rrTypeAny DNS record type<any>

The most used record classes are A, AAAA, PTR, CNAME and MX, but any supported DNS record name can be used here.

By default, this field is not filtered.

Result format

The result format is JSON, and consists of a result container, and a number of results.

The result container has the following format

    "responseCode": 200, # the response code. Normal responses should return HTTP code 200
    "count": 20,         # the total number of matching records. If this value is lower than the imposed limit, the resultset is truncated!
    "limit": 25,         # the limit imposed on the query results (default is 25). Use the limit parameter in the request to set a higher limit.
    "offset": 0,         # the offset applied on the query results (default i 0)
    "currentPage": 1,    # the current "page" (calculated from limit/offset)
    "size": 20,          # the size of the current resultset (should be same as count or limit)
    "data": [],          # the list of query result objects
    "messages": [],      # any server messages
    "metaData": {},      # any server metadata}


Each query result has the following format:

    "rrclass": "in",                      # the DNS record class
    "rrtype": "a",                        # the DNS record type
    "query": "",                  # the DNS record query part
    "answer": "",           # the DNS record answer part
    "firstSeenTimestamp": 1340308340000,  # the first registered timestamp for this record 
    "lastSeenTimestamp": 1377520248000,   # the last registered timestamp for this record
    "maxTtl": 300,                        # the maximum TTL observed for this record
    "minTtl": 300,                        # the minimum TTL observed for this record
    "times": 675,                         # the number of times this record has been observed
    "tlp": "white",                       # the TLP of this record. Public records have TLP "white"
    "customer": null,                     # the customer owning this record. Public records have value null.
    "createdTimestamp": 0,                # always returns 0
    "lastUpdatedTimestamp": 0,            # always returns 0



Query for any record concerning the domain ""
Includes both DNS records for queries for and DNS records returning the value ""
Does not contain subdomains of

Query for any record concerning the domain "".
Return all results, no matter how big the resultset is.
Query for  A-records for the domain ""
Query for  A-records and MX-records for the domain ""
Query for any record for the IPv4 address ""

Query for any record for the IPv6 address "2a04:4e42:400::323"

JSON query format

An alternative to a simple GET-string is a POST query with a JSON query format to the URL


curl -X POST -d '
  "query": "",
  "rrClass": [
  "rrType": [
  "limit": 0,
  "offset": 0

The POST-query is currently permitting the same parameters as the GET query, but new future parameters or advanced/nested parameters may be added only to the JSON query format as an "advanced format".

Authenticated queries

The PDNS API is publicly available, and does not require authentication.

However, unauthenticated queries are limited to see only public data (TLP white), and are limited to 1000 requests per day (currently).
To acquire higher resource limits, you need to perform authenticated queries.

To request an API key from mnemonic, contact

To access private data (granted that mnemonic is collecting PDNS data from your customer), see the PassiveDNS Integration Guide in the Argus API integration documentation.

If you have an API-key, you can a HTTP header to your request:

Argus-API-Key: 1234/1/abcd1234ef012


curl -H "Argus-API-Key: 1234/1/abcd1234ef012" -X GET

Resource limits

All users are subject to resource limitations.

  • Unauthenticated users are limited to 100 requests per minute, and 1000 requests per day.
  • Authenticated users are limited according to their agreement with mnemonic.

If you hit the resource limit, Argus will return a 402 error, with the following JSON response:

    "responseCode": 402,
    "data": null,
    "messages": [
            "message": "Resource limit exceeded",
            "messageTemplate": "resource.limit.exceeded",
            "type": "ACTION_ERROR"
    "metaData": {
        "millisUntilResourcesAvailable": 558


The resource limit is calculated both per minute and per day.

  • If you reach the per-minute (short-term) resource limit, you will typically be rejected for a short period, to save resources on our end.
  • If you reach the per-day (long-term) resource limit, you will typically be rejected for a period up to 24 hours. This means you have exhausted the data quota granted by mnemonic.


If you find yourself reaching the per-day resource limit a lot, you may want to request a higher resource quota from mnemonic

Please use the metadata key "millisUntilResourcesAvailable" to let your client back off gracefully.



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