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Floating IPs

A Floating IP is a static public IPv4 address that you can reassign between instances instantly — without changing DNS or waiting for TTL.

When to Use Floating IPs

  • Blue/green deployments — provision the new version, then flip the Floating IP to it. Zero downtime, instant rollback.
  • High availability failover — if your primary fails, reassign the IP to a hot standby in seconds
  • Stable DNS — point your domain's A record at a Floating IP; swap the underlying instance without touching DNS

Reserve a Floating IP

POST /v1/floating-ips
{
  "region": "vh-us-south-1"
}

# Response
{
  "id": "fip_abc123",
  "ip": "203.0.113.42",
  "region": "vh-us-south-1",
  "instance_id": null
}

Assign to an Instance

POST /v1/floating-ips/fip_abc123/assign
{ "instance_id": "inst_def456" }

The IP is routed to the new instance within 5 seconds — no DNS change needed.

Unassign / Reassign

# Unassign without deleting
POST /v1/floating-ips/fip_abc123/unassign

# Reassign to a different instance
POST /v1/floating-ips/fip_abc123/assign
{ "instance_id": "inst_new789" }

Pricing

  • Floating IPs are free while assigned to a running instance
  • $2/month when reserved but unassigned (to discourage IP hoarding)

Related

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