diff --git a/app/models/ip_block.rb b/app/models/ip_block.rb
index 4c95ac38dea..b3b678a6a16 100644
--- a/app/models/ip_block.rb
+++ b/app/models/ip_block.rb
@@ -31,9 +31,10 @@ class IpBlock < ApplicationRecord
 
   after_commit :reset_cache
 
-  def to_log_human_identifier
+  def to_cidr
     "#{ip}/#{ip.prefix}"
   end
+  alias to_log_human_identifier to_cidr
 
   class << self
     def blocked?(remote_ip)
diff --git a/app/serializers/rest/admin/ip_block_serializer.rb b/app/serializers/rest/admin/ip_block_serializer.rb
index 6a38f8b566f..4b782da53a7 100644
--- a/app/serializers/rest/admin/ip_block_serializer.rb
+++ b/app/serializers/rest/admin/ip_block_serializer.rb
@@ -9,6 +9,6 @@ class REST::Admin::IpBlockSerializer < ActiveModel::Serializer
   end
 
   def ip
-    "#{object.ip}/#{object.ip.prefix}"
+    object.to_cidr
   end
 end
diff --git a/app/views/admin/ip_blocks/_ip_block.html.haml b/app/views/admin/ip_blocks/_ip_block.html.haml
index 3dc6f8f8e57..0a1b864c6e2 100644
--- a/app/views/admin/ip_blocks/_ip_block.html.haml
+++ b/app/views/admin/ip_blocks/_ip_block.html.haml
@@ -3,7 +3,7 @@
     = f.check_box :ip_block_ids, { multiple: true, include_hidden: false }, ip_block.id
   .batch-table__row__content.pending-account
     .pending-account__header
-      %samp= link_to "#{ip_block.ip}/#{ip_block.ip.prefix}", admin_accounts_path(ip: "#{ip_block.ip}/#{ip_block.ip.prefix}")
+      %samp= link_to ip_block.to_cidr, admin_accounts_path(ip: ip_block.to_cidr)
       - if ip_block.comment.present?
         ·
         = ip_block.comment
diff --git a/lib/mastodon/cli/ip_blocks.rb b/lib/mastodon/cli/ip_blocks.rb
index f1f40c99ce3..ef9562fa6dd 100644
--- a/lib/mastodon/cli/ip_blocks.rb
+++ b/lib/mastodon/cli/ip_blocks.rb
@@ -108,9 +108,9 @@ module Mastodon::CLI
       IpBlock.severity_no_access.find_each do |ip_block|
         case options[:format]
         when 'nginx'
-          say "deny #{ip_block.ip}/#{ip_block.ip.prefix};"
+          say "deny #{ip_block.to_cidr};"
         else
-          say "#{ip_block.ip}/#{ip_block.ip.prefix}"
+          say ip_block.to_cidr
         end
       end
     end
diff --git a/spec/lib/mastodon/cli/ip_blocks_spec.rb b/spec/lib/mastodon/cli/ip_blocks_spec.rb
index d531b8b7a86..1f903ac065c 100644
--- a/spec/lib/mastodon/cli/ip_blocks_spec.rb
+++ b/spec/lib/mastodon/cli/ip_blocks_spec.rb
@@ -251,12 +251,12 @@ RSpec.describe Mastodon::CLI::IpBlocks do
 
       it 'exports blocked IPs with "no_access" severity in plain format' do
         expect { subject }
-          .to output_results("#{first_ip_range_block.ip}/#{first_ip_range_block.ip.prefix}\n#{second_ip_range_block.ip}/#{second_ip_range_block.ip.prefix}")
+          .to output_results("#{first_ip_range_block.to_cidr}\n#{second_ip_range_block.to_cidr}")
       end
 
       it 'does not export blocked IPs with different severities' do
         expect { subject }
-          .to_not output_results("#{third_ip_range_block.ip}/#{first_ip_range_block.ip.prefix}")
+          .to_not output_results(third_ip_range_block.to_cidr)
       end
     end
 
@@ -265,19 +265,19 @@ RSpec.describe Mastodon::CLI::IpBlocks do
 
       it 'exports blocked IPs with "no_access" severity in plain format' do
         expect { subject }
-          .to output_results("deny #{first_ip_range_block.ip}/#{first_ip_range_block.ip.prefix};\ndeny #{second_ip_range_block.ip}/#{second_ip_range_block.ip.prefix};")
+          .to output_results("deny #{first_ip_range_block.to_cidr};\ndeny #{second_ip_range_block.to_cidr};")
       end
 
       it 'does not export blocked IPs with different severities' do
         expect { subject }
-          .to_not output_results("deny #{third_ip_range_block.ip}/#{first_ip_range_block.ip.prefix};")
+          .to_not output_results("deny #{third_ip_range_block.to_cidr};")
       end
     end
 
     context 'when --format option is not provided' do
       it 'exports blocked IPs in plain format by default' do
         expect { subject }
-          .to output_results("#{first_ip_range_block.ip}/#{first_ip_range_block.ip.prefix}\n#{second_ip_range_block.ip}/#{second_ip_range_block.ip.prefix}")
+          .to output_results("#{first_ip_range_block.to_cidr}\n#{second_ip_range_block.to_cidr}")
       end
     end
   end
diff --git a/spec/models/ip_block_spec.rb b/spec/models/ip_block_spec.rb
index 18fb7ea136b..a8b0809511a 100644
--- a/spec/models/ip_block_spec.rb
+++ b/spec/models/ip_block_spec.rb
@@ -26,6 +26,22 @@ RSpec.describe IpBlock do
     end
   end
 
+  describe '#to_cidr' do
+    subject { Fabricate.build(:ip_block, ip:).to_cidr }
+
+    context 'with an IP and a specified prefix' do
+      let(:ip) { '192.168.1.0/24' }
+
+      it { is_expected.to eq('192.168.1.0/24') }
+    end
+
+    context 'with an IP and a default prefix' do
+      let(:ip) { '192.168.1.0' }
+
+      it { is_expected.to eq('192.168.1.0/32') }
+    end
+  end
+
   describe '.blocked?' do
     context 'when the IP is blocked' do
       it 'returns true' do
diff --git a/spec/requests/api/v1/admin/ip_blocks_spec.rb b/spec/requests/api/v1/admin/ip_blocks_spec.rb
index 59ef8d29665..161781c8ed3 100644
--- a/spec/requests/api/v1/admin/ip_blocks_spec.rb
+++ b/spec/requests/api/v1/admin/ip_blocks_spec.rb
@@ -97,7 +97,7 @@ RSpec.describe 'IP Blocks' do
 
       expect(response.parsed_body)
         .to include(
-          ip: eq("#{ip_block.ip}/#{ip_block.ip.prefix}"),
+          ip: eq(ip_block.to_cidr),
           severity: eq(ip_block.severity.to_s)
         )
     end
@@ -216,7 +216,7 @@ RSpec.describe 'IP Blocks' do
       expect(response.content_type)
         .to start_with('application/json')
       expect(response.parsed_body).to match(hash_including({
-        ip: "#{ip_block.ip}/#{ip_block.ip.prefix}",
+        ip: ip_block.to_cidr,
         severity: 'sign_up_requires_approval',
         comment: 'Decreasing severity',
       }))