AS197891 - JWITA-AS CONGREGAZIONE CRISTIANA DEI TESTIMONI DI GEOVARPKI ⚠ 1/2ASPA -

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IPv6 prefix announced, but nothing inside is responding yet. AS197891 announces 2 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: 2a13:8ac0:100::1 · (no live host found) · address space: unknown · prefixes announced: 2

prefix(es): 2a13:8ac0:100::/40, 2a13:8ac0:300::/40

RPKI & ASPA

1 of 2 prefix(es) covered by a valid ROA, 1 not-found.

PrefixRPKI stateReasonCovering VRP(s)
2a13:8ac0:100::/40✓ validmatched VRP (correct origin, length within maxLength)AS197891 /40 maxLen 40 (ripe)
2a13:8ac0:300::/40- not-foundno covering VRP

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

We probed 30 arbitrary IPv6 address(es) inside AS197891's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:b00:ffff:fc27::ebc9:2 at hop 26 - that router answers ICMPv6 Echo. This is not in AS197891'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 2026-05-25T12:38:46Z

Failure detail — what to grep in your logs
vantageour sourceyour targetmethodresulttested (UTC)
go6lab2a00:8642:42::752a13:8ac0:100::1icmp6-echono_echo2026-05-25T12:38:46Z
karsolink2a12:d8c0:105a:9001::a1542a13:8ac0:100::1icmp6-echono_echo2026-05-25T12:51:08Z
odin2607:fae0:a000::422a13:8ac0:100::1icmp6-echono_echo2026-05-25T12:38:15Z

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 AS3257 (GTT-BACKBONE) · 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::31.3ms0%AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
2gw.friends.steffann.nl
2a00:8642:1000:f000::1		1.4ms0%*AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
32a00:1ca8:1::1942.4ms0%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:412.8ms0%AS50673Serverius-as - Serverius Holding B.V., NL
5*---
6*---
72001:978:3::5215.3ms0%AS174COGENT-174 - Cogent Communications, LLC, US
82001:668:0:2:ffff:0:5995:852a31.1ms0%AS3257GTT-BACKBONE - GTT Communications Inc., US
92001:668:0:3:ffff:1:0:367e32.8ms0%AS3257GTT-BACKBONE - GTT Communications Inc., US
10*---
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tracepath -6

 1?: [LOCALHOST]                        0.052ms pmtu 1500
 1:  2a00:8642:42::3                                       1.671ms 
 1:  2a00:8642:42::3                                       1.794ms 
 2:  gw.friends.steffann.nl                                2.728ms 
 3:  2a00:1ca8:1::194                                      2.900ms 
 4:  2a03:3f40::10:41                                      2.752ms 
 5:  no reply
 6:  no reply
 7:  ae1.cr9-ams1.ip6.gtt.net                             15.920ms asymm 15 
 8:  2001:668:0:2:ffff:0:5995:852a                        31.825ms asymm 13 
 9:  2001:668:0:3:ffff:1:0:367e                           33.489ms asymm 12 
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 ITA host (Karsolink)   transit only unreachable

filter likely at: past AS3257 (GTT-BACKBONE) · 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		0.4ms-AS204471KARSOLINK - 2S Computers SRL, IT
22a12:d8c0:109f:121::a10.4ms0%*AS204471KARSOLINK - 2S Computers SRL, IT
32a12:d8c0:101f:6::110.0ms0%AS204471KARSOLINK - 2S Computers SRL, IT
42a03:b020:1:51::a10.2ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
5ae16-100.cr0-mil2.ip6.gtt.net
2001:668:0:3:ffff:0:d5fe:dc4d		12.7ms0%AS3257GTT-BACKBONE - GTT Communications Inc., US
62001:668:0:2:ffff:0:5995:852a19.1ms0%AS3257GTT-BACKBONE - GTT Communications Inc., US
72001:668:0:3:ffff:1:0:367e21.0ms0%AS3257GTT-BACKBONE - GTT Communications Inc., US
8*---
9*---
10*---
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tracepath -6

 1?: [LOCALHOST]                        0.037ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                1.049ms 
 3:  2a12:d8c0:101f:6::1                                  10.400ms 
 4:  2a03:b020:1:51::a                                    10.669ms 
 5:  ae16-100.cr0-mil2.ip6.gtt.net                        10.771ms 
 6:  2001:668:0:2:ffff:0:5995:852a                        19.881ms asymm  8 
 7:  2001:668:0:3:ffff:1:0:367e                           21.558ms 
 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 AS3257 (GTT-BACKBONE) · 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		0.2ms0%*AS80386CONNECT - 6connect, Inc., US
2*---
32a03:a100:0:201:1::11.1ms70%AS56635XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4e0-1.core1.lju1.he.net
2001:470:1:5be::1		2.0ms70%AS6939HURRICANE - Hurricane Electric LLC, US
5100ge0-0-0-5.core1.vie1.he.net
2001:470:0:578::1		9.3ms0%AS6939HURRICANE - Hurricane Electric LLC, US
6*---
7be47.core3.par2.he.net
2001:470:e:13::2		26.6ms20%AS6939HURRICANE - Hurricane Electric LLC, US
8*-50%-
9*---
102001:7f8:4::cb9:131.5ms0%-NA
112001:668:0:2:ffff:0:5995:852a46.8ms0%AS3257GTT-BACKBONE - GTT Communications Inc., US
122001:668:0:3:ffff:1:0:367e50.1ms0%AS3257GTT-BACKBONE - GTT Communications Inc., US
13*---
14*---
15*---
16*---
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24*---

Rate-limited ICMPv6: hop 3, hop 4, hop 7, hop 8 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.582ms 
 1:  fw1-lju.6connect.com                                  0.536ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  2.193ms 
 4:  e0-1.core1.lju1.he.net                                2.170ms 
 5:  100ge0-0-0-5.core1.vie1.he.net                       10.104ms 
 6:  no reply
 7:  be47.core3.par2.he.net                               27.851ms 
 8:  be2.core4.lon2.he.net                                33.565ms 
 9:  no reply
10:  2001:7f8:4::cb9:1                                    31.818ms 
11:  2001:668:0:2:ffff:0:5995:852a                        47.104ms asymm 15 
12:  2001:668:0:3:ffff:1:0:367e                           48.630ms 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