If you want to have your own IP assignments with your own ASN and network you will need to have a multi-homed network, so you need to have multiple diverse providers to do this. To have one transit company mange this for you it would really need to be either through your DC if they offer this service or from a bandwidth broker that would provide this service for you. I'm not aware of any tier 1 providers that would manage other providers for you.
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As a hosting provider, you prefer to build your network by taking multiple quality upstreams, peering or you shall appoint one transit company to manage for you?
Excellent query! The preference is normally to build your own network by using multiple quality upstreams.
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Yes, definitely as a hosting supplier. We are planning to build our own network by taking multiple quality up streams, but it is quite challenging to manage and we are hunting down for the organization to oversee it for us and seeking is as yet going ahead with multiple consideration on the file.