Networking
AWS Data Transfer
- Timenot billed
- Bytesbilled
- Unitsnot billed
In one line
Per GB of traffic that leaves a Region, crosses Availability Zones, or goes out to the internet.
What gets missed
Traffic that never leaves AWS still bills: cross-AZ chatter is charged per GB in both directions, and cross-Region copies are charged on the way out. Inbound from the internet is free, which is why egress is the shock.
Find it on your bill
Filter Cost Explorer or your Cost and Usage Report by these usage types. A usage type with no region prefix means us-east-1.
DataTransfer-Out-BytesDataTransfer-Regional-BytesUSE1-USW2-AWS-Out-Bytes
Bills the same way
These services turn exactly the same meters, so what you learn here transfers.