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avicarage
Beginner

on ‎08-05-2026 23h00

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Message 1 of 3

BT DNS Issues

Is anyone else having issues with BT DNS this evening?

DNS shows as 81.139.56.100 as default but nothing will connect using this DNS. Manually changing my DNS to 8.8.8.8 (Google) instantly connects which would indicate an issue on BT's side as opposed to anything internal on my side. 

 

Tracert to 81.139.56.100 shows the below:

1 <1 ms <1 ms <1 ms 192.168.1.254
2 1 ms 1 ms 2 ms 172.16.18.217
3 * * * Request timed out.
4 10 ms 9 ms 9 ms 62.172.102.142
5 * * * Request timed out.
6 * * * Request timed out.
7 * * * Request timed out.
8 * * * Request timed out.
9 * * * Request timed out.
10 * * * Request timed out.
11 * * * Request timed out.
12 * * * Request timed out.
13 * * * Request timed out.
14 * * * Request timed out.
15 * * * Request timed out.
16 * * * Request timed out.
17 * * * Request timed out.
18 * * * Request timed out.
19 * * * Request timed out.
20 * * * Request timed out.
21 * * * Request timed out.
22 * * * Request timed out.
23 * * * Request timed out.
24 * * * Request timed out.
25 * * * Request timed out.
26 * * * Request timed out.
27 * * * Request timed out.
28 * * * Request timed out.
29 * * * Request timed out.
30 * * * Request timed out.

Trace complete.

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2 REPLIES 2
bobpullen
Contributor

on ‎09-05-2026 9h16

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Message 2 of 3

Re: BT DNS Issues

I'm not sure that traceroute is indicative of anything. I see timeouts after few hops too: -

Bob> tracert 81.139.56.100

Tracing route to 81.139.56.100 over a maximum of 30 hops

  1    <1 ms    <1 ms    <1 ms  home.gateway [192.168.1.254]
  2    <1 ms     1 ms     1 ms  172.16.17.177
  3     *        *        *     Request timed out.
  4    10 ms     9 ms    10 ms  109.159.255.96
  5     7 ms     7 ms     7 ms  109.159.250.79
  6     *        *        *     Request timed out.
  7     *        *        *     Request timed out.
  8     *        *        *     Request timed out.
  9     *        *        *     Request timed out.
 10     *        *        *     Request timed out.
 11     *        *        *     Request timed out.
 12     *        *        *     Request timed out.
        ...

Yet the server is responding to DNS lookups: -

Bob> nslookup bbc.co.uk 81.139.56.100
Server:  UnKnown
Address:  81.139.56.100

Non-authoritative answer:
Name:    bbc.co.uk
Addresses:  2a04:4e42:400::81
          2a04:4e42:200::81
          2a04:4e42:600::81
          2a04:4e42::81
          151.101.0.81
          151.101.192.81
          151.101.128.81
          151.101.64.81
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avicarage
Beginner

on ‎09-05-2026 10h01

2 Views
Message 3 of 3

Re: BT DNS Issues

Suppose it may be blocked from ping requests which would explain that to be fair.

 

Either way the BT DNS isn't allowing me to connect to the internet, whereas Google's public DNS is if I manually change it on any single device connected to either the WiFi or an ethernet connection, which would indicate that the issue lies on the BT infrastructure side as opposed to anything my side. I'll try to get back onto tech support this morning but was mostly wondering if it was a me issue or a wider one.

 

Cheers for the response!

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