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This table lists the current status of DNS-over-TLS related features in the latest stable releases of a selection of commonly used DNS software.

See the DNS-over-TLS reference material page for more details on the indivudual features. 

Clients

Mode

Stub 

Recursive resolver

Software

ldns

(drill)

digit

getdns

BIND

(dig)

getdns*

UnboundBIND

Knot

Res

 

 

TCP/TLS Features

TCP fast open** (tick)

(tick)

 

P

  (tick)
Connection reuse (Q/R, Q/R, Q/R) (tick)

(tick)

(tick)  (tick)(tick)

Pipelining of queries(Q,Q,Q,R,R,R)

n/a(tick)

(tick)

(tick)  (tick)(tick)
Process OOOR (Q1,Q2,R2,R1)n/a (tick)

(tick)

(tick)  (tick)(tick)
EDNS0 Keepalive***  (tick)     

 

 

TLS Features

TLS encryption (Port 853) (tick)(tick) (tick)(tick)  
TLS authentication  (tick)     
EDNS0 Padding  (tick)     

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