AS205727 - ARUBAPL-AS ArubaPARPKI ✓ 1/1ASPA ✓

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IPv6 prefix announced, but nothing inside is responding yet. AS205727 announces 1 IPv6 prefix(es) to the global routing table - that’s the part that BGP and our route-server scrape confirm. But our active discovery (curated hostnames, holder-derived domains, authoritative DNS NS/SOA/MX, certificate-transparency hostnames, RIPE Atlas, RDAP, IPv6 Hitlist) found no ICMPv6-responsive host inside the prefix on either vantage, and a yarrp pass against random addresses inside the prefix produced zero in-prefix hops (no router on the path through the AS replied with Time-Exceeded for any random target). That combination usually means the announcement is configured but the addresses inside aren’t in active use yet. The BGP route is there; the operational deployment is still ahead.

AS overview

Test target: 2a00:6d47::1 · (no live host found) · address space: PA · prefixes announced: 1

prefix(es): 2a00:6d47::/36

RPKI & ASPA

1 of 1 prefix(es) covered by a valid ROA.

PrefixRPKI stateReasonCovering VRP(s)
2a00:6d47::/36✓ validmatched VRP (correct origin, length within maxLength)AS205727 /36 maxLen 48 (ripe); AS31034 /29 maxLen 48 (ripe)

ASPA: this AS has published an ASPA record listing 4 upstream provider(s) that are authorized to propagate routes from it: AS1299, AS3356, AS19905, AS24724. Routes from this AS that arrive via any other upstream are considered ASPA-invalid by validators that enforce ASPA.

Random-IP probe (yarrp) into the AS' prefixes

We probed 15 arbitrary IPv6 address(es) inside AS205727's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:2035:0:1431::2 at hop 12 - that router does not answer ICMPv6 Echo. This is not in AS205727's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP peering address or an upstream's /127 link). The traceroute boundary is the AS edge: ICMPv6 Time-Exceeded responses from anything inside this AS are filtered.

ICMPv6 Type 2 (Packet Too Big) acceptance - active test

Type 2 active test inconclusive: no Echo Reply to 1300-byte probe.
method: ICMPv6 Echo + forged PTB, tested 2026-05-25T12:29:29Z

Failure detail — what to grep in your logs
vantageour sourceyour targetmethodresulttested (UTC)
go6lab2a00:8642:42::752a00:6d47::1icmp6-echono_echo2026-05-25T12:29:29Z
karsolink2a12:d8c0:105a:9001::a1542a00:6d47::1icmp6-echono_echo2026-05-25T12:32:54Z
odin2607:fae0:a000::422a00:6d47::1icmp6-echono_echo2026-05-25T12:29:18Z

Attempt log (go6lab):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: timed out
  3. tls → no_tcp: TLS connect failed
  4. http → no_tcp: tcp/80 not open

Attempt log (karsolink):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: timed out
  3. tls → no_tcp: TLS connect failed
  4. http → no_tcp: tcp/80 not open

Attempt log (odin):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: timed out
  3. tls → no_tcp: TLS connect failed
  4. http → no_tcp: tcp/80 not open

To match the corresponding ICMPv6 packet on your side (host firewall, AS edge, or transit tap), look for our PTBs around the timestamps above:

sudo tcpdump -i any -n -e 'icmp6 and ip6[40] = 2 and (src host 2607:fae0:a000::42 or src host 2a00:8642:42::75 or src host 2a12:d8c0:105a:9001::a154)'

If you see our PTBs arriving but the destination's TCP/Echo flow does not shrink, the drop is in the destination kernel (cause 3 below). If you don't see them at all, drop is upstream of you (cause 2). If you only see them from one of our two source IPs, the drop is path-asymmetric — one transit on the asymmetric route is filtering, the other is not.

From NL host (go6lab)   transit only unreachable

filter likely at: past AS1299 (TWELVE99) · min PMTU on path: 1500

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a00:8642:42::31.6ms0%AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
2*-0%*-
32a00:1ca8:1::1942.8ms0%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:412.9ms0%AS50673Serverius-as - Serverius Holding B.V., NL
5*-90%-
6*---
72001:978:3::264.3ms0%AS174COGENT-174 - Cogent Communications, LLC, US
82001:2034:a:2f44.2ms10%-
9*---
10war-b8-link.ip.twelve99.net
2001:2034:a:12b::1		25.2ms0%AS1299TWELVE99 - Arelion Sweden AB, SE
112001:2034:a:e227.1ms0%-
12aruba-ic-326816.ip.twelve99-cust.net
2001:2035:0:1431::2		24.1ms0%AS1299TWELVE99 - Arelion Sweden AB, SE
13*---
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24*---

Rate-limited ICMPv6: hop 5, hop 8 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.033ms pmtu 1500
 1:  2a00:8642:42::3                                       1.474ms 
 1:  2a00:8642:42::3                                       1.409ms 
 2:  gw.friends.steffann.nl                                2.391ms 
 3:  2a00:1ca8:1::194                                      3.093ms 
 4:  2a03:3f40::10:41                                      3.096ms 
 5:  no reply
 6:  no reply
 7:  2001:978:3::26                                        3.852ms asymm  6 
 8:  adm-bb2-link.ip.twelve99.net                          3.898ms asymm  7 
 9:  no reply
10:  war-b8-link.ip.twelve99.net                          26.163ms asymm  9 
11:  war-b4-link.ip.twelve99.net                          25.984ms asymm 10 
12:  aruba-ic-326816.ip.twelve99-cust.net                 24.632ms asymm 11 
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
23:  no reply
24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From ITA host (Karsolink)   transit only unreachable

filter likely at: past AS3356 (LEVEL3) · min PMTU on path: 1500

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1karsolink-01.net.karsolink.com
2a12:d8c0:105a:9001::1		0.3ms0%*AS204471KARSOLINK - 2S Computers SRL, IT
22a12:d8c0:109f:121::a10.4ms0%*AS204471KARSOLINK - 2S Computers SRL, IT
32a12:d8c0:101f:6::110.1ms0%AS204471KARSOLINK - 2S Computers SRL, IT
42a03:b020:1:51::a10.2ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
52001:1900:5:2:2::5b1d25.1ms0%AS3356LEVEL3 - Level 3 Parent, LLC, US
6lo0.0.edge5.Warsaw1.level3.net
2001:4c08::4a		37.6ms0%AS3356LEVEL3 - Level 3 Parent, LLC, US
72001:1900:5:2:2::4dc636.1ms0%AS3356LEVEL3 - Level 3 Parent, LLC, US
8*---
9*---
10*---
11*---
12*---
13*---
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24*---

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                0.959ms 
 3:  2a12:d8c0:101f:6::1                                  10.467ms 
 4:  2a03:b020:1:51::a                                    10.734ms 
 5:  2001:1900:5:2:2::5b1d                                21.789ms asymm  8 
 6:  lo0.0.edge5.warsaw1.level3.net                       37.553ms asymm  8 
 7:  2001:1900:5:2:2::4dc6                                36.769ms asymm 13 
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
23:  no reply
24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From SLO host (6connect)   transit only unreachable

filter likely at: past AS3356 (LEVEL3) · min PMTU on path: 1500

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1fw1-lju.6connect.com
2607:fae0:a000::2		0.3ms0%*AS80386CONNECT - 6connect, Inc., US
2ccr-to-fw-ccr1-gw-lju.6connect.com
2607:fae0:a000:2::2		0.5ms0%*AS80386CONNECT - 6connect, Inc., US
32a00:ee1:800:9::11.9ms50%AS5603SIOL-NET - Telekom Slovenije, d.d., SI
42a00:ee0:1:15::21.2ms0%AS5603SIOL-NET - Telekom Slovenije, d.d., SI
52001:1900:5:2:2:0:11c:d496.5ms0%AS3356LEVEL3 - Level 3 Parent, LLC, US
6lo0.0.edge5.Warsaw1.level3.net
2001:4c08::4a		24.1ms0%AS3356LEVEL3 - Level 3 Parent, LLC, US
72001:1900:5:2:2::4dc624.2ms0%AS3356LEVEL3 - Level 3 Parent, LLC, US
8*---
9*---
10*---
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---
20*---
21*---
22*---
23*---
24*---

Rate-limited ICMPv6: hop 3 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.574ms 
 1:  fw1-lju.6connect.com                                  0.492ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                     1.987ms 
 4:  2a00:ee0:1:15::2                                      1.133ms asymm  3 
 5:  2001:1900:5:2:2:0:11c:d49                             8.690ms asymm  7 
 6:  lo0.0.edge5.Warsaw1.level3.net                       23.676ms asymm  9 
 7:  2001:1900:5:2:2::4dc6                                24.273ms asymm  9 
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
23:  no reply
24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500