Dear Twitter, can you recommend an infrastructure provider with global data centres (at minimum two US coasts, Europe, Asia), outbound traffic ports not limited, and can reserve a small block of elastic IP addresses? For our distributed assessments at @hardenize.
Inflexible networking at cloud providers is a pet peeve. @Linode is the most flexible I know of, and I think would meet all your requirements except for contiguous IPv4 addresses. Maybe they'll set them up for you if you ask.