I have several Google verification codes sent from an account called "Google" and also some other Google verification code received that were sent from four different phone numbers. Do Google use multiple different phone lines for sending out verification codes? How can I tell whether these codes are actually sent from Google?
How can I tell whether these codes are actually sent from Google?
I can now send you a code from any number/any name I want and you would probably believe it came from Google.
When you try to input the code I sent you to the 2FA it will not work verifying that I am indeed not Google.
Do Google use multiple different phone lines for sending out verification codes
Google probably uses a 3rd party service for sending the SMS. Even if they didn't, in order to scale they would need multiple lines since most carriers have SMS limits.
Google uses voip services. They have a "pool" of available phone numbers to send you messages from, thus you will have a difficult time finding out if the number is actually google. However, there are reverse phone number lookup services out there that may be of assistance to you; just google it.
For reference, usually google verification codes show up with "G-######" and only show up when you login to a google service from unrecognized location/machine/or if you have 2fa enabled. Hope this helps!