extra unknow costs in my account

Based on the information you've provided, I can explain the charges you're seeing:

1. Route 53: The charge of $0.50 is for a hosted zone in Route 53. AWS charges $0.50 per hosted zone for the first 25 hosted zones, and this is not covered under the Free Tier. If you've created a DNS hosted zone for your domain, this is why you're seeing this charge.

2. Public IPv4 Address Charges: You're seeing two types of IPv4 address charges:

• Free Tier usage: 54.919 hours of public IPv4 addresses attached to EC2 instances (which is covered under Free Tier)
• Charged usage: 84.081 hours of "Idle public IPv4 address" at $0.005 per hour, resulting in a $0.42 charge

The "Idle public IPv4 address" charge is likely for one of these reasons:

• You have an Elastic IP that's not attached to a running EC2 instance
• You have public IPv4 addresses associated with non-EC2 resources (like RDS with public access, Load Balancers, etc.)

It's important to note that while AWS Free Tier includes 750 hours of public IPv4 address usage per month, this only applies to public IPs attached to EC2 instances. Public IPs used by other services or unattached Elastic IPs will incur charges at $0.005 per hour.

To avoid these charges in the future:

• Release any unattached Elastic IPs
• Consider using private endpoints for services like RDS instead of public access
• Use the Public IP Insights feature in the VPC console to identify which resources are using public IPv4 addresses
• Delete any Route 53 hosted zones you don't need
  Sources
  Charged for AWS Free Tier when using RDS and S3 | AWS re:Post
  VPC charge on free tier | AWS re:Post
  Charged on Free Tier for VPC | AWS re:Post
  Unexpected $0.13 Charge for “In-use public IPv4 address” on Free Tier EC2 Instance | AWS re:Post
  Charged for a public IPv4 address of VPC in free tier | AWS re:Post