diff --git a/.github/workflows/build-lists.yml b/.github/workflows/build-lists.yml
index 5205215..d747e37 100644
--- a/.github/workflows/build-lists.yml
+++ b/.github/workflows/build-lists.yml
@@ -19,6 +19,22 @@ jobs:
         steps:
             - name: Checkout
               uses: actions/checkout@v3
+            - name: Cache cargo binaries
+              uses: actions/cache@v3
+              id: cache-dns-ptr-resolver
+              with:
+                  path: ~/.cargo/bin/dns-ptr-resolver
+                  key: ${{ runner.os }}-cargo-bin-kbs-1.0.0
+            - name: Set up toolchain
+              if: steps.cache-dns-ptr-resolver.outputs.cache-hit != 'true'
+              uses: actions-rs/toolchain@v1
+              with:
+                  profile: minimal
+                  toolchain: 1.64.0
+                  override: true
+            - name: Install dns-ptr-resolver
+              if: steps.cache-dns-ptr-resolver.outputs.cache-hit != 'true'
+              run: cargo install dns-ptr-resolver@1.0.0
             #- name: Build the binaryedge list
             #  run: ./make-binaryedge.sh
             - name: Build the stretchoid list
diff --git a/make-stretchoid.sh b/make-stretchoid.sh
index 581dc54..5e11cc0 100755
--- a/make-stretchoid.sh
+++ b/make-stretchoid.sh
@@ -15,7 +15,7 @@ if [ ! -d ./reverse_revisions/ ]; then
 fi
 
 # With failure handling
-cat stretchoid_digitalocean_possible_ips.txt | xargs -P 50 -I {} bash -c 'set -eu;rev="$(dig @9.9.9.9 +short +time=1 +tries=1 -x {})"; if [[ "$rev" == *";;"* ]]; then sleep 1; rev="$(dig @8.8.8.8 +short +time=1 +tries=1 -x {})"; fi; echo "{} # $rev";' 1> stretchoid_revisions/$REV.txt
+dns-ptr-resolver $PWD/stretchoid_digitalocean_possible_ips.txt 1> stretchoid_revisions/$REV.txt
 
 grep -F "stretchoid" stretchoid_revisions/$REV.txt | sort -V > stretchoid_revisions/$REV.sorted.txt
 grep -v -F "stretchoid" stretchoid_revisions/$REV.txt | sort -V > reverse_revisions/$REV.sorted.txt