---
title: "ASN History of IPv4 Address"
slug: "asn-history-of-ipv4-address"
updated: 2026-01-07T16:43:04Z
published: 2026-01-07T16:43:04Z
---

> ## 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.

# ASN History of IPv4 Address

```plaintext
GET /explore/ip2asn/history/ipv4/{ipv4
```

Show historic ASN and subnet allocation information for IPv4 address.

| Query**Parameters:** | - **window = (int) (optional) –** - look back days into the past and show all ASNs this IPv4 address has been assigned to - default = 90 - **date = (string) (optional) –** - if given, overrides window and gives ASN and subnet information for the specified date |
| --- | --- |
| **Request headers:** | - *X-API-KEY - api-key* |

## Example Request

```plaintext
https://api.silentpush.com/api/v1/merge-api/explore/ip2asn/history/ipv4/91.199.74.9?window=180
```

## Example Response

```python
{
    "status_code": 200,
    "error": null,
    "response": {
        "records": [
            {
                "asn": 35470,
                "asname": "XL-AS, NL",
                "first": "2021-05-27",
                "last": "2021-09-08",
                "subnet": "91.199.74.0/24"
            },
            {
                "asn": 61317,
                "asname": "ASDETUK www.heficed.com, GB",
                "first": "2021-04-22",
                "last": "2021-05-20",
                "subnet": "91.199.74.0/24"
            },
            {
                "asn": 1273,
                "asname": "CW Vodafone Group PLC, EU",
                "first": "2021-03-12",
                "last": "2021-04-21",
                "subnet": "91.199.74.0/24"
            }
        ]
    }
}
```

Autonomous System Number, a unique numeric identifier assigned to an Autonomous System (AS) for managing IP address routing within and between networks on the internet

A DNS request (resource record name, rrname) used to retrieve information about a domain, IP, or other network entity for threat analysis.