@Fernando Aceves Have you seen NetSuite IP Addresses? Is DNS lookup to outboundips.netsuite.com an option

Yes I've seen that documentation.

@Fernando Aceves i kid you not, we maintain a list for our customers by implmenting an outbound https call into a restlet in the same netsuite instance, and we log the login audit trail it serves the purpose...

Thank you n.n

the reason we do this is, some of the banks we deal with our customers that require whitelisting do a really archaic dns backtrace, and if you dns backtrace netsuite address, in the modern day, you'll reach the equivalent services like aws cloudfront which does a rerouting, so when you do a general retrace of the address coming your door, the retrace will inevitably just knock on the rerouting ip... sadly calling ourself to maintain a list only solves it case by case basis... and alas isn't great i admit

I get it, yeah, reading how netsuite operates one can understand why they don't give IP ranges, but whitelisting some security services can be very limited sometimes as you said.