---
title: kDNSServiceFlagsBackgroundTrafficClass
framework: dnssd
role: symbol
role_heading: Global Variable
path: dnssd/kdnsserviceflagsbackgroundtrafficclass
---

# kDNSServiceFlagsBackgroundTrafficClass

## Declaration

```swift
var kDNSServiceFlagsBackgroundTrafficClass: UInt32 { get }
```

## Discussion

Discussion This flag is meaningful in DNSServiceBrowse, DNSServiceGetAddrInfo, DNSServiceQueryRecord, and DNSServiceResolve. When set, it uses the background traffic class for packets that service the request.