PowerShell script to measure latency (by opening a TCP connection since ICMP is blocked) to all america nearest AWS regions.

aws_latency.ps1

# List of AWS regions
$regions = @(
  "us-east-1","us-east-2","us-west-1","us-west-2",
  "ca-central-1",
  "eu-west-1","eu-west-2","eu-west-3","eu-central-1","eu-north-1","eu-south-1",
  "ap-east-1","ap-south-1","ap-northeast-1","ap-northeast-2","ap-northeast-3",
  "ap-southeast-1","ap-southeast-2",
  "sa-east-1",
  "me-south-1","af-south-1"
)

# Measure and collect latencies
$results = foreach ($r in $regions) {
  $endpoint = "ec2.$r.amazonaws.com"
  $sw = [Diagnostics.Stopwatch]::StartNew()
  try {
    $tcp = [Net.Sockets.TcpClient]::new()
    $tcp.Connect($endpoint, 443)
    $tcp.Close()
  } catch {
    # ignore errors
  }
  $sw.Stop()
  [PSCustomObject]@{
    Region    = $r
    Endpoint  = $endpoint
    LatencyMs = [math]::Round($sw.Elapsed.TotalMilliseconds,2)
  }
}

# Show the top 5 fastest regions
$results |
  Sort-Object LatencyMs |
  Select-Object -First 5 |
  Format-Table Region, @{n='Latency (ms)';e={$_.LatencyMs}} -AutoSize