Maybe following information can help. I’ve run tcpdump on my Pi, filtered for the IP of creativecommons.tankerkoenig.de. There is only one line and it looks like the DNS response (*.1.99 is my Router, *.1.48 is the Pi):
13:21:21.291450 IP 192.168.1.99.domain > 192.168.1.48.42147: 12092 1/0/0 A 188.68.35.147 (65)
For comparison here the same with dumping all with the IP of api.wunderground.com. The DNS response is a little bit different and I think, your binding dont even try to open a connection and the binding except before.
13:26:45.824582 IP 192.168.1.99.domain > 192.168.1.48.60560: 47231 3/0/0 CNAME api.wunderground.com.edgekey.net., CNAME e12930.g.akamaiedge.net., A 23.53.166.130 (134)
13:26:45.826121 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [S], seq 3497460722, win 29200, options [mss 1460,sackOK,TS val 25244367 ecr 0,nop,wscale 7], length 0
13:26:45.854850 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [S.], seq 3022217929, ack 3497460723, win 28960, options [mss 1460,sackOK,TS val 1122679933 ecr 25244367,nop,wscale 5], length 0
13:26:45.855055 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 1, win 229, options [nop,nop,TS val 25244369 ecr 1122679933], length 0
13:26:45.866506 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [P.], seq 1:244, ack 1, win 229, options [nop,nop,TS val 25244371 ecr 1122679933], length 243: HTTP: GET /api/03800101a14c990f/conditions/forecast10day/lang:DE/q/50.95868301,13.43252182.json HTTP/1.1
13:26:45.907002 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], ack 244, win 939, options [nop,nop,TS val 1122679977 ecr 25244371], length 0
13:26:46.224067 IP 192.168.1.99.domain > 192.168.1.48.38566: 22422 1/0/0 PTR a23-53-166-130.deploy.static.akamaitechnologies.com. (109)
13:26:46.236194 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 1:1449, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP: HTTP/1.1 200 OK
13:26:46.236342 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 1449, win 251, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.236466 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 1449:2897, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP
13:26:46.236508 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 2897, win 274, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.236628 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 2897:4345, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP
13:26:46.236677 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 4345, win 296, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.236851 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 4345:5793, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP
13:26:46.236883 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 5793, win 319, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.237108 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 5793:7241, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP
13:26:46.237150 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 7241, win 342, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.237296 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 7241:8689, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP
13:26:46.237330 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 8689, win 364, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.238765 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 8689:10137, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP
13:26:46.238838 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 10137, win 387, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.239062 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 10137:11585, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP
13:26:46.239123 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 11585, win 410, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.239511 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 11585:13033, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP: ": 265
13:26:46.239547 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 13033, win 432, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.239718 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 13033:14481, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP
13:26:46.239759 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 14481, win 455, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.239883 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 14481:15929, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP
13:26:46.239916 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 15929, win 477, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.240087 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 15929:17377, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP
13:26:46.240134 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 17377, win 500, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.240442 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 17377:18825, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP
13:26:46.240549 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 18825, win 523, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.240636 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [.], seq 18825:20273, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1448: HTTP
13:26:46.240669 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 20273, win 545, options [nop,nop,TS val 25244408 ecr 1122680313], length 0
13:26:46.248581 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [P.], seq 20273:21636, ack 244, win 939, options [nop,nop,TS val 1122680313 ecr 25244371], length 1363: HTTP
13:26:46.248695 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 21636, win 568, options [nop,nop,TS val 25244409 ecr 1122680313], length 0
13:26:56.275531 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [F.], seq 244, ack 21636, win 568, options [nop,nop,TS val 25245412 ecr 1122680313], length 0
13:26:56.325773 IP a23-53-166-130.deploy.static.akamaitechnologies.com.http > 192.168.1.48.53167: Flags [F.], seq 21636, ack 245, win 939, options [nop,nop,TS val 1122690403 ecr 25245412], length 0
13:26:56.325909 IP 192.168.1.48.53167 > a23-53-166-130.deploy.static.akamaitechnologies.com.http: Flags [.], ack 21637, win 568, options [nop,nop,TS val 25245417 ecr 1122690403], length 0