Hi Darren, 1. How are you querying the LRN? Are you certain that you are not querying a provider who is serving you cached data? Like it or not, LRN caching is pretty much table stakes in the industry for any second-tier provider. 2. Did/can your upstream origination provider disclose to you the intended porting target, i.e. the underlying carrier to whom they will be porting the number? 3. Is the LRN dip on the number literally returning the same _LRN_ as it did before, or is that unknown? Is it possible that the port was in some way internal to the same carrier who owns the number? Some LECs operate different switches for different purposes, and, when porting, will port internally? LRNs are unique per OCN per LATA, but the point is that it is conceivable the OCN would not change in this situation. -- Alex -- Alex Balashov | Principal | Evariste Systems LLC 303 Perimeter Center North, Suite 300 Atlanta, GA 30346 United States Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/