diff --git a/parsedmarc/resources/maps/base_reverse_dns_map.csv b/parsedmarc/resources/maps/base_reverse_dns_map.csv
index e69d13a6..69f0b492 100644
--- a/parsedmarc/resources/maps/base_reverse_dns_map.csv
+++ b/parsedmarc/resources/maps/base_reverse_dns_map.csv
@@ -221,6 +221,7 @@ mailchannels.net,MailChannels,Web Host
 mailcontrol.com,Forcepoint,Email Security
 mailgun.info,Mailgun,SaaS
 mailgun.net,Mailgun,SaaS
+mailgun.us,Mailgun,SaaS
 mailhop.org,DuoCircle,Email Security
 mailhostbox.com,Unified Layer,Web Host
 mailinblack.com,Mailinblack,Email Security