AS31222 - ASN-TERRA Mewecom Italia spaPARPKI -ASPA -

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IPv6 prefix announced, but nothing inside is responding yet. AS31222 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: 2a02:7320::1 · (no live host found) · address space: PA · prefixes announced: 1

prefix(es): 2a02:7320::/32

RPKI & ASPA

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

PrefixRPKI stateReasonCovering VRP(s)
2a02:7320::/32- not-foundno covering VRP

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

We probed 15 arbitrary IPv6 address(es) inside AS31222's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:7d8::26 at hop 15 - that router does not answer ICMPv6 Echo. This is not in AS31222'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 2026-05-25T12:31:51Z

Failure detail — what to grep in your logs
vantageour sourceyour targetmethodresulttested (UTC)
go6lab2a00:8642:42::752a02:7320::1icmp6-echono_echo2026-05-25T12:31:51Z
karsolink2a12:d8c0:105a:9001::a1542a02:7320::1icmp6-echono_echo2026-05-25T12:39:53Z
odin2607:fae0:a000::422a02:7320::1icmp6-echono_echo2026-05-25T12:31:33Z

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 AS3302 (AS-RETELIT-IRIDEOS) · 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::31.4ms0%AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
2*-0%*-
32a00:1ca8:1::1942.8ms0%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:412.6ms0%AS50673Serverius-as - Serverius Holding B.V., NL
5*-60%-
6*---
7be2950.ccr42.fra05.atlas.cogentco.com
2001:550:0:1000::9a36:482a		12.8ms0%AS174COGENT-174 - Cogent Communications, LLC, US
8*-50%-
9port-channel5892.ccr92.mil02.atlas.cogentco.com
2001:550:0:1000::9a36:3ed9		24.5ms0%AS174COGENT-174 - Cogent Communications, LLC, US
10be2434.rcr71.vce01.atlas.cogentco.com
2001:550:0:1000::9a36:279e		30.9ms0%AS174COGENT-174 - Cogent Communications, LLC, US
11*-0%-
122001:978:2:11::b:236.7ms0%AS174COGENT-174 - Cogent Communications, LLC, US
13*---
14*---
152a02:7d8::2644.5ms0%AS3302AS-RETELIT-IRIDEOS - Retelit Digital Services S.p.A., IT
16*---
17*---
18*---
19*---
20*---
21*---
22*---
23*---
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]                        0.138ms pmtu 1500
 1:  2a00:8642:42::3                                       1.516ms 
 1:  2a00:8642:42::3                                       2.040ms 
 2:  gw.friends.steffann.nl                                2.380ms 
 3:  2a00:1ca8:1::194                                      2.971ms 
 4:  2a03:3f40::10:41                                      3.197ms 
 5:  no reply
 6:  no reply
 7:  be3343.ccr41.fra05.atlas.cogentco.com                11.704ms 
 8:  no reply
 9:  port-channel5892.ccr92.mil02.atlas.cogentco.com      25.328ms 
10:  be2155.rcr71.vce01.atlas.cogentco.com                30.566ms 
11:  be2440.rcr51.rom01.atlas.cogentco.com                35.763ms 
12:  2001:978:2:11::b:2                                   36.563ms 
13:  no reply
14:  no reply
15:  2a02:7d8::26                                         44.473ms 
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 AS3302 (AS-RETELIT-IRIDEOS) · 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
1*-0%*-
2*---
32a12:d8c0:101f:6::110.0ms40%AS204471KARSOLINK - 2S Computers SRL, IT
4irideos.minap.it
2001:7f8:c5::a500:3302:1		10.5ms0%AS3302IRIDEOS S.p.A.
52a02:7d8::114.2ms0%AS3302AS-RETELIT-IRIDEOS - Retelit Digital Services S.p.A., IT
6*---
72a02:7d8::2619.4ms0%AS3302AS-RETELIT-IRIDEOS - Retelit Digital Services S.p.A., IT
8*-90%-
9*---
10*---
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---
20*---
21*---
22*---
23*---
24*---

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

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.760ms 
 1:  karsolink-01.net.karsolink.com                        0.654ms 
 2:  2a12:d8c0:109f:121::a1                                0.863ms 
 3:  2a12:d8c0:101f:6::1                                  10.532ms 
 4:  irideos.minap.it                                     11.210ms 
 5:  2a02:7d8::1                                          14.988ms asymm  7 
 6:  no reply
 7:  2a02:7d8::26                                         14.879ms 
 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 AS3302 (AS-RETELIT-IRIDEOS) · 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		0.4ms0%*AS80386CONNECT - 6connect, Inc., US
2ccr-to-fw-ccr1-gw-lju.6connect.com
2607:fae0:a000:2::2		0.9ms-AS80386CONNECT - 6connect, Inc., US
32a03:a100:0:201:1::11.0ms90%AS56635XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4e0-1.core1.lju1.he.net
2001:470:1:5be::1		2.0ms0%AS6939HURRICANE - Hurricane Electric LLC, US
5*---
6port-channel1.core1.zag2.he.net
2001:470:0:2ea::2		3.8ms0%AS6939HURRICANE - Hurricane Electric LLC, US
7*---
8irideos.minap.it
2001:7f8:c5::a500:3302:1		13.3ms0%AS3302IRIDEOS S.p.A.
92a02:7d8::116.2ms0%AS3302AS-RETELIT-IRIDEOS - Retelit Digital Services S.p.A., IT
10*---
112a02:7d8::2616.2ms0%AS3302AS-RETELIT-IRIDEOS - Retelit Digital Services S.p.A., IT
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]                        0.028ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.538ms 
 1:  fw1-lju.6connect.com                                  0.719ms 
 2:  no reply
 3:  no reply
 4:  e0-1.core1.lju1.he.net                                2.463ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.533ms 
 7:  no reply
 8:  irideos.minap.it                                     12.746ms 
 9:  2a02:7d8::1                                          16.435ms asymm 11 
10:  no reply
11:  2a02:7d8::26                                         16.645ms 
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