---
title: "Reverse PADNS Lookup"
slug: "reverse-padns-lookup"
updated: 2026-01-07T18:26:03Z
published: 2026-01-07T18:26:03Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.silentpush.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Reverse PADNS Lookup

```plaintext
GET /explore/padns/lookup/answer/{qtype}/{qname}
```

Reverse lookup of Passive DNS data.

| **Query Parameters:** | - **qtype (string) (required) –** - the following qypes are supported: - a - aaaa - cname - mx - ns - ptr4 - ptr6 - any - anyipv4 - anyipv6 - soa - txt - **qname (string) (required) –** - specify a name or IP address to lookup - name - wildcards (*) are supported in name string - IPv4 - IPv6 - **netmask = (int) (optional) –** - net mask may be given for qtypes ptr4 or ptr6 - defaults: IPv4 = 32, IPv6 = 128 - **subdomains = (int) (optional) –** - include or exclude subdomains from qtype a or aaaa results - 0 = exclude - 1 = include - **regex = (pattern) (optional) –** - re2 regular expression - pattern must be a valid re2 regular expression - **match = (string) (optional) –** - limit results to self-hosted infrastructure for qtype mx or ns - strict (default) - find all matching results - self - only show results where mx or ns records are in the same domain as qname - **first_seen_after = (optional) –** - first_seen timestamp must be on or after this time - date: yyyy-mm-dd (2021-07-09) - fixed date - epoch: number (1625834953) - fixed time in epoch format - sec: negative number (-172800) - relative time seconds ago - time period: negative number with time period (-36h / -5d / -3w / -6m) - relative time ago - h : hours - d : days - w : weeks - m : months - **first_seen_before = (optional) –** - first_seen timestamp must be on or before this time - date: yyyy-mm-dd (2021-07-09) - fixed date - epoch: number (1625834953) - fixed time in epoch format - sec: negative number (-172800) - relative time seconds ago - time period: negative number with time period (-36h / -5d / -3w / -6m) - relative time ago - h : hours - d : days - w : weeks - m : months - **last_seen_after = (optional) –** - last_seen timestamp must be on or after this time - date: yyyy-mm-dd (2021-07-09) - fixed date - epoch: number (1625834953) - fixed time in epoch format - sec: negative number (-172800) - relative time seconds ago - time period: negative number with time period (-36h / -5d / -3w / -6m) - relative time ago - h : hours - d : days - w : weeks - m : months - **last_seen_before = (optional) –** - last_seen timestamp must be on or before this time - date: yyyy-mm-dd (2021-07-09) - fixed date - epoch: number (1625834953) - fixed time in epoch format - sec: negative number (-172800) - relative time seconds ago - time period: negative number with time period (-36h / -5d / -3w / -6m) - relative time ago - h : hours - d : days - w : weeks - m : months - **as_of = (optional) –** - only return records where the as_of timestamp equivalent is between the first_seen and the last_seen timestamp - date: yyyy-mm-dd (2021-07-09) - fixed date - epoch: number (1625834953) - fixed time in epoch format - sec: negative number (-172800) - relative time seconds ago - time period: negative number with time period (-36h / -5d / -3w / -6m) - relative time ago - h : hours - d : days - w : weeks - m : months - **sort = (optional) –** - order results in specified order - parameter may be repeated with different column names to produce a nested sorting effect - sort: - last_seen/last/time_last - synonyms for last_seen column - first_seen/first/time_first - synonyms for first_seen column - query/rrname - synonyms for query column - answer/rdata - synonyms for answer_seen column - order: - asc/+/up - synonyms for ascending order - desc/-/down - synonyms for descending order - **output_format = (optional) –** - padns (default) - Silent Push padns output format - cof - common output format - **limit = (int) (optional) –** - number of results to return - default = 100 - **skip = (int) (optional) –** - number of results to skip - **prefer = (string) (optional) –** - result (default) - return results if available before max_wait timeout, otherwise return job_id - job_id - return job_id immediately - **max_wait = (int) (optional) –** - number of seconds to wait for results before returning job_id - default = 25 - value in the range from 0 to 25 - **with_metadata =<0\|1> (int) (optional) –** - include metadata object in response : returned results, total results, job_id - 0 (default) = do not include - 1 = include metadata |
| --- | --- |
| **Request headers:** | - *X-API-KEY - api-key* |

> [!NOTE]
> Note
> 
> Wildcards (*) are supported in qname.
> 
> ```plaintext
> https://api.silentpush.com/api/v1/merge-api/explore/padns/lookup/answer/ns/vida.ns.cloudflare.com
> ```

> [!NOTE]
> Note
> 
> The reverse TXT lookup will look for the string given in qname anywhere in the TXT record value.
> 
> ```plaintext
> https://api.silentpush.com/api/v1/merge-api/explore/padns/lookup/answer/txt/verification*=70c3e598
> ```

> [!NOTE]
> Note
> 
> Wildcards (*) may be used in qname for reverse txt lookup.
> 
> ```plaintext
> https://api.silentpush.com/api/v1/merge-api/explore/padns/lookup/answer/txt/verification*=70c3e598
> ```

> [!NOTE]
> Note
> 
> The reverse SOA lookup will look for the string given in qname anywhere in the SOA record value.
> 
> ```plaintext
> https://api.silentpush.com/api/v1/merge-api/explore/padns/lookup/answer/soa/jomax
> ```

> [!NOTE]
> Note
> 
> Wildcards (*) may be used in qname for reverse SOA lookup.
> 
> ```plaintext
> https://api.silentpush.com/api/v1/merge-api/explore/padns/lookup/answer/soa/jomax.net*20210725
> ```

> [!NOTE]
> Note
> 
> Regular expression patterns must follow the re2 specification - backtracking and look-around assertions are not supported.

> [!NOTE]
> Note
> 
> For best performance, regular expressions should begin with ^ and end with $, i.e., match from the beginning of name to end of name.

> [!CAUTION]
> Warning
> 
> Regular expressions are slower than exact or wildcard matches - wildcards should be used instead, whenever possible.

> [!CAUTION]
> Warning
> 
> Regular expressions are not supported for qtype=txt or type-soa.

## Example Request

```plaintext
https://api.silentpush.com/api/v1/merge-api/explore/padns/lookup/answer/ns/vida.ns.cloudflare.com \
     ?last_seen_after=2021-07-01 \
     &limit=2
```

## Example Response

```python
{
    "status_code": 200,
    "error": null,
    "response": {
        "records": [
            {
                "answer": "vida.ns.cloudflare.com",
                "count": 58,
                "first_seen": "2021-04-30 18:29:30",
                "last_seen": "2021-07-10 18:32:14",
                "nshash": "7659b08bfceced5ef1ad24c26d2e8078",
                "query": "gsjjyzs.com",
                "ttl": 86400,
                "type": "NS"
            },
            {
                "answer": "vida.ns.cloudflare.com",
                "count": 7,
                "first_seen": "2021-07-05 19:42:44",
                "last_seen": "2021-07-10 18:32:11",
                "nshash": "28e44562b64c3a4f355a877e97cb6fa4",
                "query": "gscooling.com",
                "ttl": 86400,
                "type": "NS"
            }
        ]
    }
}
```