Sendgrid - Approximate list of the IP addresses that the domain sendgrid.net allows email to be sent from according to their SPF record

50.31.32.0/19 (8192 addresses)
149.72.0.0/16 (65536 addresses)
159.183.0.0/16 (65536 addresses)
167.89.0.0/17 (32768 addresses)
168.245.0.0/17 (32768 addresses)
192.254.112.0/20 (4096 addresses)
198.21.0.0/21 (2048 addresses)
198.37.144.0/20 (4096 addresses)
208.117.48.0/20 (4096 addresses)
223.165.113.0/24 (256 addresses)
223.165.115.0/24 (256 addresses)
223.165.118.0/23 (512 addresses)
223.165.120.0/23 (512 addresses)