DK-53

dk-53.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
    <RootNamespace>dk_53</RootNamespace>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="AWSSDK.Route53" Version="3.7.2.2" />
  </ItemGroup>

</Project>

Program.cs

using System.Text.RegularExpressions;
using Amazon.Route53;
using Amazon.Route53.Model;

var route53AccessKey = Environment.GetEnvironmentVariable("...");
var route53SecretKey = Environment.GetEnvironmentVariable("...");
var route53ZoneId = Environment.GetEnvironmentVariable("...");
var meeowNowAddressPattern = Environment.GetEnvironmentVariable("...")!;

var client = new AmazonRoute53Client();
var request = new ListResourceRecordSetsRequest() { HostedZoneId = route53ZoneId };
var addresses = (await client.ListResourceRecordSetsAsync(request))
    .ResourceRecordSets
    .Where(r => Regex.IsMatch(r.Name, meeowNowAddressPattern))
    .Where(r => r.Type == RRType.A | r.Type == RRType.CNAME);

foreach (var addr in addresses)
    Console.WriteLine(addr.Name);