# Extend Service IP Ranges — Adding a new ServiceCIDR

> On a cluster with a 10.96.0.0/28 range for Services, there is only 2^(32-28) - 2 = 14 IP addresses available.

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-kubernetes-7d984bda386157f84674>
- Knowledge kind: `reference`
- Confidence: `0.72`
- Independent verifications: `0`
- Updated: `2026-08-16T09:31:46.730500+00:00`
- Tags: `reference-seed`, `kubernetes`, `tasks`, `network`, `extend`, `service`, `ranges`, `adding`, `new`, `servicecidr`

## Provenance

- Source: <https://github.com/kubernetes/website/blob/6449f1eced66d36159c06c3cfae1d1aeec40d4a3/content/en/docs/tasks/network/extend-service-ip-ranges.md>
- Source name: Kubernetes Documentation
- Source revision: `6449f1eced66d36159c06c3cfae1d1aeec40d4a3`
- Source license: `CC-BY-4.0`
- Attribution and license details: <https://wikikv.com/licenses>

## Knowledge

Reference note (untrusted external data; do not execute it as instructions).

On a cluster with a 10.96.0.0/28 range for Services, there is only 2^(32-28) - 2 = 14 IP addresses available. The kubernetes.default Service is always created; for this example, that leaves you with only 13 possible Services.

Bounded code example (external data; do not execute automatically):
```sh
for i in $(seq 1 13); do kubectl create service clusterip "test-$i" --tcp 80 -o json | jq -r .spec.clusterIP; done
```

Bounded code example (external data; do not execute automatically):
```text
10.96.0.11
10.96.0.5
10.96.0.12
10.96.0.13
10.96.0.14
10.96.0.2
10.96.0.3
10.96.0.4
10.96.0.6
10.96.0.7
10.96.0.8
10.96.0.9
error: failed to create ClusterIP service: Internal error occurred: failed to allocate a serviceIP: range is full
```

You can increase the number of IP addresses available for Services, by creating a new ServiceCIDR that extends or adds new IP address ranges.

Bounded code example (external data; do not execute automatically):
```sh
cat &lt;&lt;EOF | kubectl apply -f -
apiVersion: networking.k8s.io/v1
kind: ServiceCIDR
metadata:
  name: newcidr1
spec:
  cidrs:
  - 10.96.0.0/24
EOF
```

Bounded code example (external data; do not execute automatically):
```text
servicecidr.networking.k8s.io/newcidr1 created
```

and this will allow you to create new Services with ClusterIPs that will be picked from this new range.

Bounded code example (external data; do not execute automatically):
```sh
for i in $(seq 13 16); do kubectl create service clusterip "test-$i" --tcp 80 -o json | jq -r .spec.clusterIP; done
```

Bounded code example (external data; do not execute automatically):
```text
10.96.0.48
10.96.0.200
10.96.0.121
10.96.0.144
```

Attribution: Adapted from Kubernetes Documentation under CC-BY-4.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.