AS overview
Test target: 2a00:1cb0:1::21 · ns1.iccom.eu · address space: PA · prefixes announced: 1
prefix(es): 2a00:1cb0::/32
Targets & per-vantage-point probe results (4 target(s) across 7 vantage point(s))
Source codes (hover any badge for full description): CUR=curated · NS/SOA/MX=DNS records · SPF=SPF TXT · DRV=holder-derived (www, ns1, mail, gw, …) · ATL=RIPE Atlas · PDB=PeeringDB · WHOIS=RIPE whois · RDAP=RIPE RDAP · HIT=IPv6 Hitlist · RTR=in-prefix path hop (router) · PRB=static prefix probe · SYN=synthetic prefix::1 fallback
| Target IP / hostname | Source | SRB host (SOX, Belgrade) | DE host (Berlin) | DE host (Düsseldorf) | NL host (go6lab) | ITA host (Karsolink) | SLO host (6connect) | SLO host (T-2) | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ||
2a00:1cb0:1::1mx1.iccom.it | drv | ✓ | ✓ | refused | refused | ✓ | ✓ | ✓ | refused | refused | ✓ | ✓ | ✓ | refused | refused | ✓ | ✓ | ✓ | ? | ? | ✓ | ✓ | ✗ | refused | refused | ✓ | ✓ | ✗ | refused | refused | ✓ | ✓ | ✓ | refused | refused | - |
2a00:1cb0:1::21ns1.iccom.eu | NS | ✓ | ✓ | open | refused | ✓ | ✓ | ✓ | open | refused | ✓ | ✓ | ✓ | open | refused | ✓ | ✓ | ✓ | open | ? | ✓ | ✓ | ✗ | open | refused | ✓ | ✓ | ✓ | open | refused | ✓ | ✓ | ✓ | open | refused | ✓ |
2a00:1cb0:1::26ftp.iccom.it | drv | ✓ | ✓ | open | open | ✓ | ✓ | ✓ | open | open | ✓ | ✓ | ✓ | open | open | ✓ | ✓ | ✓ | open | open | ✓ | ✓ | ✗ | open | open | ✓ | ✓ | ✓ | open | open | ✓ | ✓ | ✓ | open | open | ✓ |
2a00:1cb0:1::39iccom.it | drv | ✓ | ✓ | open | open | ✓ | ✓ | ✓ | open | open | ✓ | ✓ | ✓ | open | open | ✓ | ✓ | ✓ | open | open | ✓ | ✓ | ✗ | open | open | ✓ | ✓ | ✗ | open | open | ✓ | ✓ | ✓ | open | open | ✓ |
RPKI & ASPA
1 of 1 prefix(es) covered by a valid ROA.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2a00:1cb0::/32 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS44219 /32 maxLen 32 (ripe) |
Random-IP probe (yarrp) into the AS' prefixes
We probed 35 arbitrary IPv6 address(es) inside AS44219's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:1418:1::10e2 at hop 8 - that router answers ICMPv6 Echo. This is not in AS44219'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 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T12:00:37Z
Multi-vantage path map
Every hop of all vantages’ traceroutes toward the target, drawn left→right, grouped into per-AS bubbles (a hop seen from several vantages is one shared bubble, so converging paths merge). It answers two questions per vantage — shown on each source bubble as echo ✓/⚠/✗ · trace ✓/✗: did the destination reply to ICMPv6 Echo (✓ honored, ⚠ replied but PTB not honored, ✗ no reply), and did the traceroute reach it. A line to the target is drawn only when that vantage got an echo reply — solid if the PTB was honored, dashed if not (reachable but a broken-PMTUD / RFC 4890 violation). The path depth still shows how far the traceroute itself got, and runs of unanswered (* *) hops collapse into one dashed “silent” bubble. Open full size ↗
- ● SRB host (SOX, Belgrade)
- ● DE host (Berlin)
- ● DE host (Düsseldorf)
- ● NL host (go6lab)
- ● ITA host (Karsolink)
- ● SLO host (6connect)
- ● SLO host (T-2)
- ── solid line = echo reply, PTB honored (clean reach)
- — — dashed line = echo reply but PTB not honored (RFC 4890 violation)
- no line = no echo reply (never reached)
- ◉ target: green = clean, amber = reachable-but-violation / unreachable
- ⚠ suspected drop AS
- ⋯ silent (unanswered) hops
- ● IXP hop
From SRB host (SOX, Belgrade) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a09:ab81::1 | 0.3ms | 0%* | AS60733 | PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS |
| 2 | sox-pn.sox.rs 2001:7f8:1e:8::3a | 0.3ms | 0% | AS13004 | SOX - Serbian Open Exchange DOO, RS |
| 3 | 2001:7f8:1e:8::3d | 0.5ms | 0% | AS13004 | SOX - Serbian Open Exchange DOO, RS |
| 4 | 2a02:2d8:0:a00e:232a | 12.7ms | 0% | - | |
| 5 | RT.TC2.AMS.NL.retn.net 2a02:2d8::57f5:e0b4 | 28.6ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 6 | ams-ix.ipv6.itgate.net 2001:7f8:1::a501:2779:1 | 30.3ms | 0% | - | NA |
| 7 | if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 2001:1418:1::10e2 | 41.3ms | 0% | AS12779 | ITGATE - IT.Gate S.p.A., IT |
| 8 | iccom-itgate.topix.it 2001:7f8:23:1::13 | 42.4ms | 0% | - | NA |
| 9 | i-web-i.iccom.it 2a00:1cb0:1::21 | 41.7ms | 0% | AS44219 | ICCOM-AS - Iccom S.r.l., IT |
tracepath -6
1?: [LOCALHOST] 0.010ms pmtu 1500
1: _gateway 1.239ms
1: _gateway 0.425ms
2: sox-pn.sox.rs 0.422ms
3: 2001:7f8:1e:8::3d 0.526ms asymm 2
4: ae8-930.RT.IRX.VIE.AT.retn.net 13.005ms asymm 3
5: RT.TC2.AMS.NL.retn.net 28.734ms
6: ams-ix.ipv6.itgate.net 30.487ms
7: if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 41.651ms asymm 6
8: no reply
9: i-web-i.iccom.it 41.930ms reached
Resume: pmtu 1500 hops 9 back 8 From DE host (Berlin) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | xe-0-0-13-178.gw01.ber01.as59645.net 2a06:d1c1:100:b::1 | 0.3ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 2 | ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02 | 0.6ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 3 | ae0-150.cr10.fra01.lwlcom.net 2a00:c380:b200:230::174 | 10.4ms | 0% | AS50629 | LWLCOM - LWLcom GmbH, DE |
| 4 | ae0-100.cr10.fra02.lwlcom.net 2a00:c380:b200:230::215 | 10.5ms | 0% | AS50629 | LWLCOM - LWLcom GmbH, DE |
| 5 | ae0-10.cr10.fra06.lwlcom.net 2a00:c380:b200:230::236 | 9.8ms | 0% | AS50629 | LWLCOM - LWLcom GmbH, DE |
| 6 | ams-ix.1-ix.net 2001:7f8:115:1::7 | 24.0ms | 0% | - | NA |
| 7 | ams-ix.ipv6.itgate.net 2001:7f8:1::a501:2779:1 | 22.3ms | 0% | - | NA |
| 8 | if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 2001:1418:1::10e2 | 27.2ms | 0% | AS12779 | ITGATE - IT.Gate S.p.A., IT |
| 9 | * | - | - | - | |
| 10 | i-web-i.iccom.it 2a00:1cb0:1::21 | 27.4ms | 0% | AS44219 | ICCOM-AS - Iccom S.r.l., IT |
tracepath -6
1?: [LOCALHOST] 0.023ms pmtu 1500
1: xe-0-0-13-178.gw01.ber01.as59645.net 0.507ms
1: xe-0-0-13-178.gw01.ber01.as59645.net 0.366ms
2: ae0-2453.cr10.ber01.lwlcom.net 0.838ms
3: ae0-150.cr10.fra01.lwlcom.net 10.381ms asymm 7
4: ae0-100.cr10.fra02.lwlcom.net 10.462ms asymm 8
5: ae0-10.cr10.fra06.lwlcom.net 10.338ms asymm 7
6: ams-ix.1-ix.net 16.715ms asymm 8
7: ams-ix.ipv6.itgate.net 22.977ms asymm 6
8: if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 27.174ms
9: iccom-itgate.topix.it 28.121ms
10: i-web-i.iccom.it 27.782ms reached
Resume: pmtu 1500 hops 10 back 10 From DE host (Düsseldorf) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | xe-0-0-12-142.gw01.dus01.as59645.net 2a06:d1c1:100:d::1 | 0.3ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 2 | eth1-0-12-h5594.edge5-dus1.bb.wiit.network 2001:4ba0:92f4:3::1 | 2.3ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 3 | lag10-h5f01.agr4-dus1.bb.wiit.network 2001:4ba0:ffe9:7c::1 | 0.8ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 4 | lag30.core3-dus1.bb.wiit.network 2001:4ba0:ffe9:109::2 | 0.2ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 5 | lag8.core1-dus-ix.bb.wiit.network 2001:4ba0:ffe9:8::2 | 0.4ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 6 | de-cix.FRA.ipv6.itgate.net 2001:7f8::31eb:0:1 | 4.6ms | 0% | - | NA |
| 7 | if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 2001:1418:1::10e2 | 15.5ms | 0% | AS12779 | ITGATE - IT.Gate S.p.A., IT |
| 8 | * | - | 40% | - | |
| 9 | i-web-i.iccom.it 2a00:1cb0:1::21 | 15.2ms | 0% | AS44219 | ICCOM-AS - Iccom S.r.l., IT |
Rate-limited ICMPv6: 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: xe-0-0-12-142.gw01.dus01.as59645.net 0.542ms
1: xe-0-0-12-142.gw01.dus01.as59645.net 0.339ms
2: eth1-0-12-h5594.edge5-dus1.bb.wiit.network 2.224ms
3: no reply
4: lag11.core3-dus1.bb.wiit.network 0.379ms
5: lag8.core1-dus-ix.bb.wiit.network 0.587ms
6: de-cix.FRA.ipv6.itgate.net 4.352ms
7: if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 14.807ms
8: no reply
9: i-web-i.iccom.it 15.367ms reached
Resume: pmtu 1500 hops 9 back 9 From NL host (go6lab) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a00:8642:42::2 | 1.1ms | 0% | AS203993 | GNA-DC1-AS - S.J.M. Steffann, NL |
| 2 | gw.friends.steffann.nl 2a00:8642:1000:f000::1 | 4.7ms | 0%* | AS203993 | GNA-DC1-AS - S.J.M. Steffann, NL |
| 3 | ccr2-ccr1.dc1.nogalliance.org 2a00:8642:dc1:2::b | 6.3ms | 0% | AS203993 | GNA-DC1-AS - S.J.M. Steffann, NL |
| 4 | ams-ix.ipv6.itgate.net 2001:7f8:1::a501:2779:1 | 6.6ms | 10% | - | NA |
| 5 | if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 2001:1418:1::10e2 | 21.3ms | 30% | AS12779 | ITGATE - IT.Gate S.p.A., IT |
| 6 | * | - | 50% | - | |
| 7 | i-web-i.iccom.it 2a00:1cb0:1::21 | 24.7ms | 0% | AS44219 | ICCOM-AS - Iccom S.r.l., IT |
Rate-limited ICMPv6: hop 4, hop 5, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.043ms pmtu 1500
1: 2a00:8642:42::2 1.791ms
1: 2a00:8642:42::2 3.112ms
2: gw.friends.steffann.nl 2.020ms
3: ccr2-ccr1.dc1.nogalliance.org 2.440ms asymm 2
4: ams-ix.ipv6.itgate.net 6.246ms asymm 3
5: if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 22.596ms asymm 4
6: no reply
7: i-web-i.iccom.it 23.795ms reached
Resume: pmtu 1500 hops 7 back 6 From ITA host (Karsolink) echo onlyRFC 4890 ✓
filter likely at: destination AS44219 (ICCOM-AS) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | * | - | 0%* | - | |
| 2 | * | - | - | - | |
| 3 | * | - | 90% | - | |
| 4 | itgate.minap.it 2001:7f8:c5::a501:2779:1 | 10.0ms | 0% | AS12779 | ITgate S.p.A. |
| 5 | if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 2001:1418:1::10e2 | 12.1ms | 0% | AS12779 | ITGATE - IT.Gate S.p.A., IT |
| 6 | iccom-itgate.topix.it 2001:7f8:23:1::13 | 13.6ms | 20% | - | NA |
| 7 | i-web-i.iccom.it 2a00:1cb0:1::21 | 12.7ms | 0% | AS44219 | ICCOM-AS - Iccom S.r.l., IT |
Rate-limited ICMPv6: hop 3, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.055ms pmtu 1500
1: karsolink-01.net.karsolink.com 0.505ms
1: karsolink-01.net.karsolink.com 0.696ms
2: 2a12:d8c0:109f:121::a1 0.639ms
3: 2a12:d8c0:101f:6::1 10.366ms
4: itgate.minap.it 10.429ms asymm 5
5: if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 12.704ms
6: no reply
7: i-web-i.iccom.it 13.084ms reached
Resume: pmtu 1500 hops 7 back 7 From SLO host (6connect) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | fw1-lju.6connect.com 2607:fae0:a000::2 | 0.5ms | 0%* | AS8038 | 6CONNECT - 6connect, Inc., US |
| 2 | * | - | 0%* | - | |
| 3 | 2a00:ee1:800:9::1 | 1.9ms | 0% | AS5603 | SIOL-NET - Telekom Slovenije, d.d., SI |
| 4 | 2a00:ee0:1:15::2 | 1.3ms | 0% | AS5603 | SIOL-NET - Telekom Slovenije, d.d., SI |
| 5 | de-cix.FRA.ipv6.itgate.net 2001:7f8::31eb:0:1 | 18.8ms | 50% | - | NA |
| 6 | if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 2001:1418:1::10e2 | 18.8ms | 90% | AS12779 | ITGATE - IT.Gate S.p.A., IT |
| 7 | * | - | - | - | |
| 8 | i-web-i.iccom.it 2a00:1cb0:1::21 | 18.8ms | 0% | AS44219 | ICCOM-AS - Iccom S.r.l., IT |
Rate-limited ICMPv6: hop 5, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.016ms pmtu 9000
1: fw1-lju.6connect.com 0.719ms
1: fw1-lju.6connect.com 0.486ms
2: no reply
3: 2a00:ee1:800:9::1 2.271ms
4: 2a00:ee0:1:15::2 1.404ms asymm 3
5: 2a00:ee0:1:10::2 1.477ms pmtu 1500
5: de-cix.FRA.ipv6.itgate.net 15.363ms asymm 9
6: if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 18.996ms asymm 9
7: no reply
8: i-web-i.iccom.it 19.077ms reached
Resume: pmtu 1500 hops 8 back 11 From SLO host (T-2) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | * | - | 0%* | - | |
| 2 | 2a01:260:1::225 | 2.2ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 3 | 2a01-260-1-1--9a.core6.t-2.net 2a01:260:1:1::9a | 1.6ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 4 | hurricane-electric.nikhef.nlsix.net 2001:7f8:13::a500:6939:1 | 33.3ms | 0%* | - | NA |
| 5 | hurricane-electric.nikhef.nlsix.net 2001:7f8:13::a500:6939:1 | 35.1ms | 0% | - | NA |
| 6 | * | - | - | - | |
| 7 | ams-ix.ipv6.itgate.net 2001:7f8:1::a501:2779:1 | 32.9ms | 0% | - | NA |
| 8 | if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 2001:1418:1::10e2 | 35.7ms | 0% | AS12779 | ITGATE - IT.Gate S.p.A., IT |
| 9 | i-web-i.iccom.it 2a00:1cb0:1::21 | 35.6ms | 60% | AS44219 | ICCOM-AS - Iccom S.r.l., IT |
Rate-limited ICMPv6: hop 9 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.025ms pmtu 1500
1: 2a01:261:313:b814::1 0.806ms
1: 2a01:261:313:b814::1 1.000ms
2: 2a01:260:1::225 3.222ms
3: 2a01-260-1-1--9a.core6.t-2.net 3.170ms
4: 2a01-260-1-1--39.core6.t-2.net 2.360ms asymm 3
5: hurricane-electric.nikhef.nlsix.net 35.236ms asymm 4
6: ams-ix.ipv6.itgate.net 37.046ms
7: no reply
8: if-0-2-0-1.Muttley-Monster.TRN.ipv6.itgate.net 37.287ms
9: i-web-i.iccom.it 40.356ms reached
Resume: pmtu 1500 hops 9 back 10