Here's the full `dig` output for the error if anyone wants to look into this deeper:
```
lain@ayumu ~> dig @8.8.8.8 glasgow-embedded.org

; <<#>> DiG 9.10.6 <<#>> @8.8.8.8 glasgow-embedded.org
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 53866
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
; OPT=15: 00 17 5b 31 37 33 2e 32 34 36 2e 31 30 30 2e 34 34 5d 20 72 63 6f 64 65 3d 53 45 52 56 46 41 49 4c 20 66 6f 72 20 67 6c 61 73 67 6f 77 2d 65 6d 62 65 64 64 65 64 2e 6f 72 67 2f 61 ("..[173.246.100.44] rcode=SERVFAIL for glasgow-embedded.org/a")
; OPT=15: 00 17 5b 32 31 37 2e 37 30 2e 31 38 37 2e 32 38 5d 20 72 63 6f 64 65 3d 53 45 52 56 46 41 49 4c 20 66 6f 72 20 67 6c 61 73 67 6f 77 2d 65 6d 62 65 64 64 65 64 2e 6f 72 67 2f 61 ("..[217.70.187.28] rcode=SERVFAIL for glasgow-embedded.org/a")
; OPT=15: 00 17 5b 32 31 33 2e 31 36 37 2e 32 33 30 2e 31 5d 20 72 63 6f 64 65 3d 53 45 52 56 46 41 49 4c 20 66 6f 72 20 67 6c 61 73 67 6f 77 2d 65 6d 62 65 64 64 65 64 2e 6f 72 67 2f 61 ("..[213.167.230.1] rcode=SERVFAIL for glasgow-embedded.org/a")
; OPT=15: 00 16 41 74 20 64 65 6c 65 67 61 74 69 6f 6e 20 67 6c 61 73 67 6f 77 2d 65 6d 62 65 64 64 65 64 2e 6f 72 67 20 66 6f 72 20 67 6c 61 73 67 6f 77 2d 65 6d 62 65 64 64 65 64 2e 6f 72 67 2f 61 ("..At delegation glasgow-embedded.org for glasgow-embedded.org/a")
;; QUESTION SECTION:
;glasgow-embedded.org.        IN    A

;; Query time: 167 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Nov 23 15:31:27 PST 2024
;; MSG SIZE  rcvd: 306
```