diff --git a/capsulflask/admin.py b/capsulflask/admin.py
index 8368224..50cc61e 100644
--- a/capsulflask/admin.py
+++ b/capsulflask/admin.py
@@ -35,17 +35,10 @@ def index():
     display_host = dict(name=host_id, networks=value['networks'])
 
     for network in display_host['networks']:
-      public_ipv4_cidr_block_split = network["public_ipv4_cidr_block"].split("/")
-      if len(public_ipv4_cidr_block_split) != 2:
-        raise ValueError(f"network {network['network_name']} has invalid cidr block {network['public_ipv4_cidr_block']}")
 
-      network_start_int = int(ipaddress.ip_address(public_ipv4_cidr_block_split[0]))+1
+      network_start_int = int(ipaddress.ip_address(network["public_ipv4_first_usable_ip"]))
+      network_end_int = int(ipaddress.ip_address(network["public_ipv4_last_usable_ip"]))
 
-      ipv4_network = ipaddress.ip_network(network["public_ipv4_cidr_block"], False)
-      network_end_int = -1
-      for ipv4_address in ipv4_network: 
-        network_end_int = int(ipv4_address)
-      
       network['allocations'] = []
       network_addresses_width = float((network_end_int-network_start_int)+1)
 
diff --git a/capsulflask/db.py b/capsulflask/db.py
index 1b75fc0..23b3621 100644
--- a/capsulflask/db.py
+++ b/capsulflask/db.py
@@ -43,7 +43,7 @@ def init_app(app, is_running_server):
   hasSchemaVersionTable = False
   actionWasTaken = False
   schemaVersion = 0
-  desiredSchemaVersion = 17
+  desiredSchemaVersion = 18
 
   cursor = connection.cursor()
 
diff --git a/capsulflask/db_model.py b/capsulflask/db_model.py
index a6ef58d..976985a 100644
--- a/capsulflask/db_model.py
+++ b/capsulflask/db_model.py
@@ -332,7 +332,9 @@ class DBModel:
 
   def list_hosts_with_networks(self, host_id: str):
     query = """
-    SELECT hosts.id, hosts.last_health_check, host_network.network_name, host_network.public_ipv4_cidr_block FROM hosts
+    SELECT hosts.id, hosts.last_health_check, host_network.network_name, 
+    host_network.public_ipv4_cidr_block, host_network.public_ipv4_first_usable_ip, host_network.public_ipv4_last_usable_ip
+    FROM hosts
     JOIN host_network ON host_network.host = hosts.id
     """
     if host_id is None: 
@@ -351,7 +353,12 @@ class DBModel:
       if row[0] not in hosts:
         hosts[row[0]] = dict(last_health_check=row[1], networks=[])
 
-      hosts[row[0]]["networks"].append(dict(network_name=row[2], public_ipv4_cidr_block=row[3]))
+      hosts[row[0]]["networks"].append(dict(
+        network_name=row[2], 
+        public_ipv4_cidr_block=row[3], 
+        public_ipv4_first_usable_ip=row[4], 
+        public_ipv4_last_usable_ip=row[5]
+      ))
 
     return hosts
 
diff --git a/capsulflask/hub_api.py b/capsulflask/hub_api.py
index 3482cf9..066c41b 100644
--- a/capsulflask/hub_api.py
+++ b/capsulflask/hub_api.py
@@ -142,14 +142,14 @@ def can_claim_create(payload, host_id) -> (str, str):
     for vm in vms:
       claimed_ipv4s[vm['public_ipv4']] = True
 
-    public_ipv4_cidr_block_split = network["public_ipv4_cidr_block"].split("/")
-    if len(public_ipv4_cidr_block_split) != 2:
-      raise ValueError(f"network {network['network_name']} has invalid cidr block {network['public_ipv4_cidr_block']}")
 
-    ipv4_network_first_address_int = int(ipaddress.ip_address(public_ipv4_cidr_block_split[0]))
     ipv4_network = ipaddress.ip_network(network["public_ipv4_cidr_block"], False)
+    ipv4_first_usable_ip = network["public_ipv4_first_usable_ip"]
+    ipv4_last_usable_ip = network["public_ipv4_last_usable_ip"]
+        
     for ipv4_address in ipv4_network: 
-      if int(ipv4_address) > ipv4_network_first_address_int and str(ipv4_address) not in claimed_ipv4s:
+      within_usable_range = ipv4_first_usable_ip <= str(ipv4_address) and str(ipv4_address) <= ipv4_last_usable_ip
+      if within_usable_range and str(ipv4_address) not in claimed_ipv4s:
         allocated_ipv4_address = str(ipv4_address)
         break 
 
diff --git a/capsulflask/schema_migrations/18_down_start_ip_end_ip.sql b/capsulflask/schema_migrations/18_down_start_ip_end_ip.sql
new file mode 100644
index 0000000..0b7725f
--- /dev/null
+++ b/capsulflask/schema_migrations/18_down_start_ip_end_ip.sql
@@ -0,0 +1,6 @@
+
+
+ALTER TABLE host_network DROP COLUMN public_ipv4_first_usable_ip;
+ALTER TABLE host_network DROP COLUMN public_ipv4_last_usable_ip;
+
+UPDATE schemaversion SET version = 17;
diff --git a/capsulflask/schema_migrations/18_up_start_ip_end_ip.sql b/capsulflask/schema_migrations/18_up_start_ip_end_ip.sql
new file mode 100644
index 0000000..b7dc702
--- /dev/null
+++ b/capsulflask/schema_migrations/18_up_start_ip_end_ip.sql
@@ -0,0 +1,25 @@
+
+
+ALTER TABLE host_network ADD COLUMN public_ipv4_first_usable_ip TEXT;
+ALTER TABLE host_network ADD COLUMN public_ipv4_last_usable_ip TEXT;
+
+-- public1, 69.61.2.162/27
+UPDATE host_network 
+SET public_ipv4_first_usable_ip = '69.61.2.163', public_ipv4_last_usable_ip = '69.61.2.190' 
+WHERE network_name = 'public1';
+
+-- public2, 69.61.2.194/26
+UPDATE host_network 
+SET public_ipv4_first_usable_ip = '69.61.2.195', public_ipv4_last_usable_ip = '69.61.2.254' 
+WHERE network_name = 'public2';
+
+-- public3, 69.61.38.193/26
+UPDATE host_network 
+SET public_ipv4_first_usable_ip = '69.61.38.194', public_ipv4_last_usable_ip = '69.61.38.254' 
+WHERE network_name = 'public3';
+
+ALTER TABLE host_network ALTER COLUMN public_ipv4_first_usable_ip SET NOT NULL;
+ALTER TABLE host_network ALTER COLUMN public_ipv4_last_usable_ip SET NOT NULL;
+
+UPDATE schemaversion SET version = 18;
+