[REN-BGP-stats-all] IPv4 R&E Routing Table Report - ASREN (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Thu Jun 12 17:05:38 UTC 2025
IPv4 R&E Routing Table Report 17:05 GMT Thu 12 Jun, 2025
IPv4 BGP Table (R&E) as seen at ASREN.
Report Website: https://bgp.nsrc.org/REN
Detailed Analysis: https://bgp.nsrc.org/REN/ASREN/
Analysis Summary
----------------
BGP routing table entries examined: 13358
Prefixes after maximum aggregation (per Origin AS): 7938
Deaggregation factor: 1.68
Unique aggregates announced (without unneeded subnets): 8596
Number of IPv4 prefixes with a valid ROA: 5664
Number of IPv4 prefixes with an invalid ROA: 1
Number of IPv4 prefixes with no ROA: 7693
Total ASes present in the Internet Routing Table: 2031
Prefixes per ASN: 6.58
Origin-only ASes present in the Internet Routing Table: 1762
Origin ASes announcing only one prefix: 824
Transit ASes present in the Internet Routing Table: 269
Transit-only ASes present in the Internet Routing Table: 42
Paths with bogon ASNs present in the IPv4 Routing Table: 0
Average AS path length visible in the Internet Routing Table: 4.5
Max AS path length visible: 13
Max AS path prepend of ASN ( 43066) 9
Prefixes from unregistered ASNs in the Routing Table: 32
Number of instances of unregistered ASNs: 32
Number of 32-bit ASNs allocated by the RIRs: 46631
Number of 32-bit ASNs visible in the Routing Table: 501
Prefixes from 32-bit ASNs in the Routing Table: 1272
Number of bogon 32-bit ASNs visible in the Routing Table: 0
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 2
Number of addresses announced to Internet: 160773248
Equivalent to 9 /8s, 149 /16s and 52 /24s
Percentage of available address space announced: 4.3
Percentage of allocated address space announced: 4.3
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 99.6
Total number of prefixes smaller than registry allocations: 1531
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 3353
Total APNIC prefixes after maximum aggregation: 1698
APNIC Deaggregation factor: 1.97
Prefixes being announced from the APNIC address blocks: 3352
Unique aggregates announced from the APNIC address blocks: 1830
APNIC Region origin ASes present in the Internet Routing Table: 452
APNIC Prefixes per ASN: 7.42
APNIC Region origin ASes announcing only one prefix: 212
APNIC Region transit ASes present in the Internet Routing Table: 42
Average APNIC Region AS path length visible: 4.1
Max APNIC Region AS path length visible: 13
Number of APNIC region 32-bit ASNs visible in the Routing Table: 200
Number of APNIC addresses announced to Internet: 37252160
Equivalent to 2 /8s, 56 /16s and 108 /24s
APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319,
58368-59391, 63488-64098, 64297-64395, 131072-155961
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8,
163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8,
203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8,
222/8, 223/8,
ARIN Region Analysis Summary
----------------------------
Prefixes being announced by ARIN Region ASes: 5708
Total ARIN prefixes after maximum aggregation: 3354
ARIN Deaggregation factor: 1.70
Prefixes being announced from the ARIN address blocks: 5755
Unique aggregates announced from the ARIN address blocks: 3742
ARIN Region origin ASes present in the Internet Routing Table: 890
ARIN Prefixes per ASN: 6.47
ARIN Region origin ASes announcing only one prefix: 317
ARIN Region transit ASes present in the Internet Routing Table: 112
Average ARIN Region AS path length visible: 5.0
Max ARIN Region AS path length visible: 10
Number of ARIN region 32-bit ASNs visible in the Routing Table: 136
Number of ARIN addresses announced to Internet: 64747488
Equivalent to 3 /8s, 219 /16s and 247 /24s
ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 62464-63487, 64198-64296, 393216-402332
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8,
67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8,
74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8,
100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8,
131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8,
139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8,
148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8,
159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8,
167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8,
184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8,
207/8, 208/8, 209/8, 214/8, 215/8, 216/8,
RIPE Region Analysis Summary
----------------------------
Prefixes being announced by RIPE Region ASes: 3119
Total RIPE prefixes after maximum aggregation: 2589
RIPE Deaggregation factor: 1.20
Prefixes being announced from the RIPE address blocks: 3108
Unique aggregates announced from the RIPE address blocks: 2636
RIPE Region origin ASes present in the Internet Routing Table: 562
RIPE Prefixes per ASN: 5.53
RIPE Region origin ASes announcing only one prefix: 253
RIPE Region transit ASes present in the Internet Routing Table: 88
Average RIPE Region AS path length visible: 3.8
Max RIPE Region AS path length visible: 12
Number of RIPE region 32-bit ASNs visible in the Routing Table: 132
Number of RIPE addresses announced to Internet: 56274816
Equivalent to 3 /8s, 90 /16s and 175 /24s
RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
59392-61439, 61952-62463, 64396-64495
196608-216475
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8,
81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8,
88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8,
95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8,
185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8,
217/8,
LACNIC Region Analysis Summary
------------------------------
Prefixes being announced by LACNIC Region ASes: 626
Total LACNIC prefixes after maximum aggregation: 238
LACNIC Deaggregation factor: 2.63
Prefixes being announced from the LACNIC address blocks: 622
Unique aggregates announced from the LACNIC address blocks: 302
LACNIC Region origin ASes present in the Internet Routing Table: 53
LACNIC Prefixes per ASN: 11.74
LACNIC Region origin ASes announcing only one prefix: 25
LACNIC Region transit ASes present in the Internet Routing Table: 13
Average LACNIC Region AS path length visible: 4.4
Max LACNIC Region AS path length visible: 8
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 16
Number of LACNIC addresses announced to Internet: 1798112
Equivalent to 0 /8s, 27 /16s and 111 /24s
LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
61440-61951, 64099-64197, 262144-274844 + ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
191/8, 200/8, 201/8,
AfriNIC Region Analysis Summary
-------------------------------
Prefixes being announced by AfriNIC Region ASes: 520
Total AfriNIC prefixes after maximum aggregation: 55
AfriNIC Deaggregation factor: 9.45
Prefixes being announced from the AfriNIC address blocks: 519
Unique aggregates announced from the AfriNIC address blocks: 84
AfriNIC Region origin ASes present in the Internet Routing Table: 31
AfriNIC Prefixes per ASN: 16.74
AfriNIC Region origin ASes announcing only one prefix: 17
AfriNIC Region transit ASes present in the Internet Routing Table: 7
Average AfriNIC Region AS path length visible: 5.8
Max AfriNIC Region AS path length visible: 9
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 17
Number of AfriNIC addresses announced to Internet: 698368
Equivalent to 0 /8s, 10 /16s and 168 /24s
AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8,
APNIC Region per AS prefix count summary
----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 600 2170 464 SINET-AS Research Organization of Informa
7497 456 180 24 CSTNET-AS-AP Computer Network Information
4538 190 4192 71 ERX-CERNET-BKB China Education and Resear
58647 182 18 2 KAGAWAU-AS Kagawa University, JP
7575 173 281 117 AARNET-AS-AP Australian Academic and Rese
55824 148 19 21 NKN-CORE-NW NKN Core Network, IN
6262 51 133 45 CSIRO Commonwealth Scientific and Industr
38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw
45773 48 3 5 HECPERN-AS-PK PERN AS Content Servie Prov
132524 42 9 10 TIFR-AS Tata Institute of Fundamental Res
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-APNIC
ARIN Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
5786 199 16 1 UPRENET, PR
376 196 162 147 RISQ-AS, CA
2920 176 34 7 LACOE, US
2152 147 507 97 CENIC-2152, US
18558 139 18 4 NETBLK-RCOEK, US
81 100 367 27 NCREN, US
23024 99 7 17 OCDE, US
21976 88 34 14 NJEDGE-NET, US
1736 79 16 1 MU-AS, US
22742 67 37 32 CT-EDU-NET, US
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-ARIN
RIPE Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
786 194 1742 187 JANET Jisc Services Limited, GB
559 114 533 104 SWITCH Peering requests: peering at switch.c
1103 96 1487 83 SURFNET-NL SURFnet, The Netherlands, NL
2614 92 26 69 ROEDUNET, RO
137 82 677 77 ASGARR Consortium GARR, IT
1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog
553 75 366 75 BELWUE BelWue-Koordination, DE
2200 63 614 58 FR-RENATER Reseau National de telecommuni
200521 58 4 24 SEAP-AGE, ES
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-RIPE
LACNIC Region per AS prefix count summary
-----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
1916 312 177 34 Rede Nacional de Ensino e Pesquisa, BR
11340 106 24 56 Red Universitaria Nacional, CL
2715 38 67 29 Fundacao Carlos Chagas Filho de Amparo a
20191 26 16 1 Pontificia Universidad Catolica de Chile,
28571 18 40 18 UNIVERSIDADE DE SAO PAULO, BR
278 11 9 9 Universidad Nacional Autonoma de Mexico,
61468 11 1 10 CEDIA, EC
21612 9 1 8 FUNDACAO INSTITUTO OSWALDO CRUZ, BR
52888 8 7 7 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR
28027 7 2 1 Escuela Superior Politecnica del Litoral,
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-LACNIC
AfriNIC Region per AS prefix count summary
------------------------------------------
ASN No of nets /20 equiv MaxAgg Description
36914 381 82 3 KENET-AS, KE
37215 36 8 1 MAREN, MW
6879 24 2 9 ENSTINET-, EG
30983 12 4 2 MARWAN-AS, MA
327700 11 16 1 MoRENet, MZ
37654 10 1 6 RwEdNet-AS, RW
37661 9 6 3 NRaE1-AS, NG
327947 5 2 3 KNUST-, GH
327798 4 0 3 BERNET, BI
327992 3 1 2 GHANAIAN-ACADEMIC-AND-RESEARCH-NETWORK, G
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-AFRINIC
Global Per AS prefix count summary
----------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 600 2170 464 SINET-AS Research Organization of Informa
7497 456 180 24 CSTNET-AS-AP Computer Network Information
36914 381 82 3 KENET-AS, KE
1916 312 177 34 Rede Nacional de Ensino e Pesquisa, BR
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
5786 199 16 1 UPRENET, PR
376 196 162 147 RISQ-AS, CA
786 194 1742 187 JANET Jisc Services Limited, GB
4538 190 4192 71 ERX-CERNET-BKB China Education and Resear
58647 182 18 2 KAGAWAU-AS Kagawa University, JP
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet
Global Per AS Maximum Aggregation summary
-----------------------------------------
ASN No of nets Net Savings Description
7497 456 432 CSTNET-AS-AP Computer Network Information Cente
36914 381 378 KENET-AS, KE
1916 312 278 Rede Nacional de Ensino e Pesquisa, BR
5786 199 198 UPRENET, PR
58647 182 180 KAGAWAU-AS Kagawa University, JP
2920 176 169 LACOE, US
18558 139 135 NETBLK-RCOEK, US
55824 148 127 NKN-CORE-NW NKN Core Network, IN
4538 190 119 ERX-CERNET-BKB China Education and Research Net
23024 99 82 OCDE, US
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-CIDRnet
List of Unregistered Origin ASNs (Global)
-----------------------------------------
Bad AS Designation Net Originated Transit AS Transit AS Name
26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.81.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.82.0/24 3112 OARNET-AS-1, US
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-badAS
Advertised Unallocated Addresses
--------------------------------
Unassigned Network ASN Information AS Name
164.160.192.0/21 Origin: 37661 NRaE1-AS, NG
164.160.192.0/21 Transit: 37288 WACREN, SN
203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP The University
203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-add-IANA
Number of prefixes announced per prefix length (Global)
-------------------------------------------------------
/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:0 /9:1 /10:1 /11:0 /12:9
/13:16 /14:30 /15:99 /16:1597 /17:283 /18:313
/19:430 /20:583 /21:588 /22:988 /23:1085 /24:7178
/25:51 /26:77 /27:29 /28:0 /29:0 /30:0
/31:0 /32:0
Advertised prefixes smaller than registry allocations
-----------------------------------------------------
ASN No of nets Total ann. Description
36914 363 381 KENET-AS, KE
1916 85 312 Rede Nacional de Ensino e Pesquisa, BR
23024 38 99 OCDE, US
200521 33 58 SEAP-AGE, ES
37215 30 36 MAREN, MW
25977 27 30 HCCS, US
32440 27 50 LONI, US
26898 24 64 RESERVED, ZZ
36794 24 26 META SOLUTIONS PIKETON, US
60187 23 48 LGFL-AS, GB
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos
Number of /24s announced per /8 block (Global)
----------------------------------------------
1:1 5:16 8:2 12:1 14:93 23:4
24:2 31:1 35:1 37:9 38:3 40:1
41:113 42:13 44:4 45:25 46:5 47:1
49:12 58:16 59:17 60:6 61:2 62:5
63:3 64:30 66:19 67:31 68:2 69:10
70:2 72:7 74:16 76:30 77:6 78:3
79:9 80:8 81:9 82:2 83:7 84:6
85:31 87:1 89:10 91:36 93:15 94:2
95:1 96:5 98:2 101:2 102:3 103:291
104:75 108:4 109:1 111:17 114:1 116:6
118:34 119:31 121:28 122:8 123:8 124:42
128:31 129:34 130:95 131:56 132:55 133:156
134:75 136:198 137:45 138:10 139:4 140:26
141:2 142:24 143:13 144:7 145:2 146:121
147:13 148:8 149:10 150:8 151:5 152:109
153:13 154:21 155:38 156:128 157:11 158:27
159:116 160:34 161:12 162:17 163:61 164:10
165:3 167:9 168:12 169:5 170:12 172:1
173:5 177:2 179:6 180:16 182:1 184:6
185:36 187:6 188:13 190:2 191:2 192:1156
193:251 194:85 195:67 196:11 197:286 198:330
199:194 200:171 201:2 202:341 203:187 204:318
205:97 206:160 207:198 208:46 209:91 210:109
211:2 212:43 213:4 216:52 217:22 219:7
222:3 223:6
End of report
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