That is a spoofed IP originating here and spoofed to Germany and back.
Coming from one of those Spots shown on US map. Will take a lot longer to figure out which one.
That is just the ISP provider. It's being routed out to Germany and back.
Run the traceroutes.and follow the ones closest to Washington. You will know if the IP is active at the time.
EVERY Provider has a block of IP's
Comcast, Timewarner..whatever Provider you have.
The provider just has those to assign to customers.
Why are we discussing the provider?
The question is What customer uses that IP from the provider
Yes it seems to follow similar patterns, sometimes other Euro countries but always ends in Chantilly.