diff --git a/fast/stages/2-networking-a-peering/landing.tf b/fast/stages/2-networking-a-peering/landing.tf
index db40b3f1..013c6e86 100644
--- a/fast/stages/2-networking-a-peering/landing.tf
+++ b/fast/stages/2-networking-a-peering/landing.tf
@@ -84,5 +84,4 @@ module "landing-nat-primary" {
   router_create  = true
   router_name    = "prod-nat-${local.region_shortnames[var.regions.primary]}"
   router_network = module.landing-vpc.name
-  router_asn     = 4200001024
 }
diff --git a/fast/stages/2-networking-a-peering/spoke-dev.tf b/fast/stages/2-networking-a-peering/spoke-dev.tf
index 2256926f..838ba6a4 100644
--- a/fast/stages/2-networking-a-peering/spoke-dev.tf
+++ b/fast/stages/2-networking-a-peering/spoke-dev.tf
@@ -80,7 +80,6 @@ module "dev-spoke-cloudnat" {
   name           = "dev-nat-${local.region_shortnames[each.value]}"
   router_create  = true
   router_network = module.dev-spoke-vpc.name
-  router_asn     = 4200001024
   logging_filter = "ERRORS_ONLY"
 }
 
diff --git a/fast/stages/2-networking-a-peering/spoke-prod.tf b/fast/stages/2-networking-a-peering/spoke-prod.tf
index b7e3abcb..7569647e 100644
--- a/fast/stages/2-networking-a-peering/spoke-prod.tf
+++ b/fast/stages/2-networking-a-peering/spoke-prod.tf
@@ -79,7 +79,6 @@ module "prod-spoke-cloudnat" {
   name           = "prod-nat-${local.region_shortnames[each.value]}"
   router_create  = true
   router_network = module.prod-spoke-vpc.name
-  router_asn     = 4200001024
   logging_filter = "ERRORS_ONLY"
 }
 
diff --git a/fast/stages/2-networking-b-vpn/landing.tf b/fast/stages/2-networking-b-vpn/landing.tf
index db40b3f1..013c6e86 100644
--- a/fast/stages/2-networking-b-vpn/landing.tf
+++ b/fast/stages/2-networking-b-vpn/landing.tf
@@ -84,5 +84,4 @@ module "landing-nat-primary" {
   router_create  = true
   router_name    = "prod-nat-${local.region_shortnames[var.regions.primary]}"
   router_network = module.landing-vpc.name
-  router_asn     = 4200001024
 }
diff --git a/fast/stages/2-networking-b-vpn/spoke-dev.tf b/fast/stages/2-networking-b-vpn/spoke-dev.tf
index 2256926f..838ba6a4 100644
--- a/fast/stages/2-networking-b-vpn/spoke-dev.tf
+++ b/fast/stages/2-networking-b-vpn/spoke-dev.tf
@@ -80,7 +80,6 @@ module "dev-spoke-cloudnat" {
   name           = "dev-nat-${local.region_shortnames[each.value]}"
   router_create  = true
   router_network = module.dev-spoke-vpc.name
-  router_asn     = 4200001024
   logging_filter = "ERRORS_ONLY"
 }
 
diff --git a/fast/stages/2-networking-b-vpn/spoke-prod.tf b/fast/stages/2-networking-b-vpn/spoke-prod.tf
index b7e3abcb..7569647e 100644
--- a/fast/stages/2-networking-b-vpn/spoke-prod.tf
+++ b/fast/stages/2-networking-b-vpn/spoke-prod.tf
@@ -79,7 +79,6 @@ module "prod-spoke-cloudnat" {
   name           = "prod-nat-${local.region_shortnames[each.value]}"
   router_create  = true
   router_network = module.prod-spoke-vpc.name
-  router_asn     = 4200001024
   logging_filter = "ERRORS_ONLY"
 }
 
diff --git a/fast/stages/2-networking-c-nva/landing.tf b/fast/stages/2-networking-c-nva/landing.tf
index 75cb9e81..e7329a43 100644
--- a/fast/stages/2-networking-c-nva/landing.tf
+++ b/fast/stages/2-networking-c-nva/landing.tf
@@ -85,7 +85,6 @@ module "landing-nat-primary" {
   router_create  = true
   router_name    = "prod-nat-${local.region_shortnames[var.regions.primary]}"
   router_network = module.landing-untrusted-vpc.name
-  router_asn     = 4200001024
 }
 
 moved {
@@ -101,7 +100,6 @@ module "landing-nat-secondary" {
   router_create  = true
   router_name    = "prod-nat-${local.region_shortnames[var.regions.secondary]}"
   router_network = module.landing-untrusted-vpc.name
-  router_asn     = 4200001024
 }
 
 # Trusted VPC
diff --git a/fast/stages/2-networking-d-separate-envs/spoke-dev.tf b/fast/stages/2-networking-d-separate-envs/spoke-dev.tf
index fd15e26c..b5b485be 100644
--- a/fast/stages/2-networking-d-separate-envs/spoke-dev.tf
+++ b/fast/stages/2-networking-d-separate-envs/spoke-dev.tf
@@ -80,7 +80,6 @@ module "dev-spoke-cloudnat" {
   name           = "dev-nat-${local.region_shortnames[each.value]}"
   router_create  = true
   router_network = module.dev-spoke-vpc.name
-  router_asn     = 4200001024
   logging_filter = "ERRORS_ONLY"
 }
 
diff --git a/fast/stages/2-networking-d-separate-envs/spoke-prod.tf b/fast/stages/2-networking-d-separate-envs/spoke-prod.tf
index c8d8a69c..bf43728d 100644
--- a/fast/stages/2-networking-d-separate-envs/spoke-prod.tf
+++ b/fast/stages/2-networking-d-separate-envs/spoke-prod.tf
@@ -79,7 +79,6 @@ module "prod-spoke-cloudnat" {
   name           = "prod-nat-${local.region_shortnames[each.value]}"
   router_create  = true
   router_network = module.prod-spoke-vpc.name
-  router_asn     = 4200001024
   logging_filter = "ERRORS_ONLY"
 }
 
diff --git a/fast/stages/2-networking-e-nva-bgp/landing.tf b/fast/stages/2-networking-e-nva-bgp/landing.tf
index 434adb85..ab6c94eb 100644
--- a/fast/stages/2-networking-e-nva-bgp/landing.tf
+++ b/fast/stages/2-networking-e-nva-bgp/landing.tf
@@ -86,7 +86,6 @@ module "landing-nat-primary" {
   router_create  = true
   router_name    = "prod-nat-${local.region_shortnames[var.regions.primary]}"
   router_network = module.landing-untrusted-vpc.name
-  router_asn     = 4200001024
 }
 
 moved {
@@ -102,7 +101,6 @@ module "landing-nat-secondary" {
   router_create  = true
   router_name    = "prod-nat-${local.region_shortnames[var.regions.secondary]}"
   router_network = module.landing-untrusted-vpc.name
-  router_asn     = 4200001024
 }
 
 # Trusted VPC