diff --git a/spec/controllers/api/v1/admin/ip_blocks_controller_spec.rb b/spec/controllers/api/v1/admin/ip_blocks_controller_spec.rb
index 50e2ae968..a5787883e 100644
--- a/spec/controllers/api/v1/admin/ip_blocks_controller_spec.rb
+++ b/spec/controllers/api/v1/admin/ip_blocks_controller_spec.rb
@@ -5,19 +5,305 @@ require 'rails_helper'
 describe Api::V1::Admin::IpBlocksController do
   render_views
 
-  let(:user)    { Fabricate(:user, role: UserRole.find_by(name: 'Admin')) }
-  let(:token)   { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: 'admin:read') }
-  let(:account) { Fabricate(:account) }
+  let(:role)    { UserRole.find_by(name: 'Admin') }
+  let(:user)    { Fabricate(:user, role: role) }
+  let(:token)   { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: scopes) }
+  let(:scopes)  { 'admin:read:ip_blocks admin:write:ip_blocks' }
 
   before do
     allow(controller).to receive(:doorkeeper_token) { token }
   end
 
+  shared_examples 'forbidden for wrong scope' do |wrong_scope|
+    let(:scopes) { wrong_scope }
+
+    it 'returns http forbidden' do
+      expect(response).to have_http_status(403)
+    end
+  end
+
+  shared_examples 'forbidden for wrong role' do |wrong_role|
+    let(:role) { UserRole.find_by(name: wrong_role) }
+
+    it 'returns http forbidden' do
+      expect(response).to have_http_status(403)
+    end
+  end
+
   describe 'GET #index' do
+    context 'with wrong scope' do
+      before do
+        get :index
+      end
+
+      it_behaves_like 'forbidden for wrong scope', 'admin:write:ip_blocks'
+    end
+
+    context 'with wrong role' do
+      before do
+        get :index
+      end
+
+      it_behaves_like 'forbidden for wrong role', ''
+      it_behaves_like 'forbidden for wrong role', 'Moderator'
+    end
+
+    it 'returns http success' do
+      get :index
+
+      expect(response).to have_http_status(200)
+    end
+
+    context 'when there is no ip block' do
+      it 'returns an empty body' do
+        get :index
+
+        json = body_as_json
+
+        expect(json).to be_empty
+      end
+    end
+
+    context 'when there are ip blocks' do
+      let!(:ip_blocks) do
+        [
+          IpBlock.create(ip: '192.0.2.0/24', severity: :no_access),
+          IpBlock.create(ip: '172.16.0.1', severity: :sign_up_requires_approval, comment: 'Spam'),
+          IpBlock.create(ip: '2001:0db8::/32', severity: :sign_up_block, expires_in: 10.days),
+        ]
+      end
+      let(:expected_response) do
+        ip_blocks.map do |ip_block|
+          {
+            id: ip_block.id.to_s,
+            ip: ip_block.ip,
+            severity: ip_block.severity.to_s,
+            comment: ip_block.comment,
+            created_at: ip_block.created_at.strftime('%Y-%m-%dT%H:%M:%S.%LZ'),
+            expires_at: ip_block.expires_at&.strftime('%Y-%m-%dT%H:%M:%S.%LZ'),
+          }
+        end
+      end
+
+      it 'returns the correct blocked ips' do
+        get :index
+
+        json = body_as_json
+
+        expect(json).to match_array(expected_response)
+      end
+
+      context 'with limit param' do
+        let(:params) { { limit: 2 } }
+
+        it 'returns only the requested number of ip blocks' do
+          get :index, params: params
+
+          json = body_as_json
+
+          expect(json.size).to eq(params[:limit])
+        end
+      end
+    end
+  end
+
+  describe 'GET #show' do
+    let!(:ip_block) { IpBlock.create(ip: '192.0.2.0/24', severity: :no_access) }
+    let(:params) { { id: ip_block.id } }
+
+    context 'with wrong scope' do
+      before do
+        get :show, params: params
+      end
+
+      it_behaves_like 'forbidden for wrong scope', 'admin:write:ip_blocks'
+    end
+
+    context 'with wrong role' do
+      before do
+        get :show, params: params
+      end
+
+      it_behaves_like 'forbidden for wrong role', ''
+      it_behaves_like 'forbidden for wrong role', 'Moderator'
+    end
+
+    it 'returns http success' do
+      get :show, params: params
+
+      expect(response).to have_http_status(200)
+    end
+
+    it 'returns the correct ip block' do
+      get :show, params: params
+
+      json = body_as_json
+
+      expect(json[:ip]).to eq("#{ip_block.ip}/#{ip_block.ip.prefix}")
+      expect(json[:severity]).to eq(ip_block.severity.to_s)
+    end
+
+    context 'when ip block does not exist' do
+      it 'returns http not found' do
+        get :show, params: { id: 0 }
+
+        expect(response).to have_http_status(404)
+      end
+    end
+  end
+
+  describe 'POST #create' do
+    let(:params) { { ip: '151.0.32.55', severity: 'no_access', comment: 'Spam' } }
+
+    context 'with wrong scope' do
+      before do
+        post :create, params: params
+      end
+
+      it_behaves_like 'forbidden for wrong scope', 'admin:read:ip_blocks'
+    end
+
+    context 'with wrong role' do
+      before do
+        post :create, params: params
+      end
+
+      it_behaves_like 'forbidden for wrong role', ''
+      it_behaves_like 'forbidden for wrong role', 'Moderator'
+    end
+
     it 'returns http success' do
-      get :index, params: { account_id: account.id, limit: 2 }
+      post :create, params: params
 
       expect(response).to have_http_status(200)
     end
+
+    it 'returns the correct ip block' do
+      post :create, params: params
+
+      json = body_as_json
+
+      expect(json[:ip]).to eq("#{params[:ip]}/32")
+      expect(json[:severity]).to eq(params[:severity])
+      expect(json[:comment]).to eq(params[:comment])
+    end
+
+    context 'when ip is not provided' do
+      let(:params) { { ip: '', severity: 'no_access' } }
+
+      it 'returns http unprocessable entity' do
+        post :create, params: params
+
+        expect(response).to have_http_status(422)
+      end
+    end
+
+    context 'when severity is not provided' do
+      let(:params) { { ip: '173.65.23.1', severity: '' } }
+
+      it 'returns http unprocessable entity' do
+        post :create, params: params
+
+        expect(response).to have_http_status(422)
+      end
+    end
+
+    context 'when provided ip is already blocked' do
+      before do
+        IpBlock.create(params)
+      end
+
+      it 'returns http unprocessable entity' do
+        post :create, params: params
+
+        expect(response).to have_http_status(422)
+      end
+    end
+
+    context 'when provided ip address is invalid' do
+      let(:params) { { ip: '520.13.54.120', severity: 'no_access' } }
+
+      it 'returns http unprocessable entity' do
+        post :create, params: params
+
+        expect(response).to have_http_status(422)
+      end
+    end
+  end
+
+  describe 'PUT #update' do
+    context 'when ip block exists' do
+      let!(:ip_block) { IpBlock.create(ip: '185.200.13.3', severity: 'no_access', comment: 'Spam', expires_in: 48.hours) }
+      let(:params) { { id: ip_block.id, severity: 'sign_up_requires_approval', comment: 'Decreasing severity' } }
+
+      it 'returns http success' do
+        put :update, params: params
+
+        expect(response).to have_http_status(200)
+      end
+
+      it 'returns the correct ip block' do
+        put :update, params: params
+
+        json = body_as_json
+
+        expect(json).to match(hash_including({
+          ip: "#{ip_block.ip}/#{ip_block.ip.prefix}",
+          severity: 'sign_up_requires_approval',
+          comment: 'Decreasing severity',
+        }))
+      end
+
+      it 'updates the severity correctly' do
+        expect { put :update, params: params }.to change { ip_block.reload.severity }.from('no_access').to('sign_up_requires_approval')
+      end
+
+      it 'updates the comment correctly' do
+        expect { put :update, params: params }.to change { ip_block.reload.comment }.from('Spam').to('Decreasing severity')
+      end
+    end
+
+    context 'when ip block does not exist' do
+      it 'returns http not found' do
+        put :update, params: { id: 0 }
+
+        expect(response).to have_http_status(404)
+      end
+    end
+  end
+
+  describe 'DELETE #destroy' do
+    context 'when ip block exists' do
+      let!(:ip_block) { IpBlock.create(ip: '185.200.13.3', severity: 'no_access') }
+      let(:params) { { id: ip_block.id } }
+
+      it 'returns http success' do
+        delete :destroy, params: params
+
+        expect(response).to have_http_status(200)
+      end
+
+      it 'returns an empty body' do
+        delete :destroy, params: params
+
+        json = body_as_json
+
+        expect(json).to be_empty
+      end
+
+      it 'deletes the ip block' do
+        delete :destroy, params: params
+
+        expect(IpBlock.find_by(id: ip_block.id)).to be_nil
+      end
+    end
+
+    context 'when ip block does not exist' do
+      it 'returns http not found' do
+        delete :destroy, params: { id: 0 }
+
+        expect(response).to have_http_status(404)
+      end
+    end
   end
 end